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Group 13 of the periodic table is also called what?
Earth makes a complete revolution around the sun about once every year.
The embryo develops in a plant inside the female plant after fertilization.
Which stage of life is typically easier for learning multiple languages?
Warm air has a lower density than cool air, so warm air rises within cooler air, similar to hot air balloons. The lower density of warm air causes it to rise above cold air.
Specific scents are often associated with what?
Why did people stop adding lead to gasoline?
A vector is characterized by the fact that it has both a magnitude or size and a direction. Vector is a measure that has both size and direction.
The outer core of the earth is molten.
In what form is most of the earth's freshwater?
Organisms that depend on other organisms for food play the role of a consumer in the food chain.
What do we call any way that animals act, either alone or with other animals
A(n) increase in length happens to metal railroad tracks during the heat of a summer day.
Organisms, both prokaryotes (the archaea and the bacteria), and eukaryotes (such as protists and unicellular fungi), reproduce asexually through binary fission; Prokaryotic organisms reproduce asexually through binary fission.
Angiosperms Flowering plants (having seeds enclosed in an ovary). Angiosperms is the term for flowering seed plants.
The outer layer of the Sun, called the corona , emits a stream of plasma called the solar wind that buffets the entire solar system. The outer layer of the sun is made up of plasma.
What can be defined simply, as a change in position?
Protons and neutrons are made from smaller particles called quarks . Protons and neutrons are made of quarks, which are fundamental particles of matter.
The lens of the eye is a(n) convex shape.
All solutions contain at least how many substances?
A drumlin is the name of a long and low hill of sediments which have been deposited by a glacier.
Elements are pure substances that make up all matter.
Corals build hard exoskeletons that grow to become coral reefs.
We call the recycling of inorganic matter between living organisms and their environment biogeochemical cycle.
Bones are made up of tissues.
Darwin believed in gradualism.
Scissors are compound machines.
A population is all the members of one species that live in the same area. All members of a species living together form a(n) population.
Water exists in three states (forms) on the Earth: Solid (ice, hail, snow, or frost) Liquid (in lakes, oceans, rain, dew, fog, or mist) Gas (steam or water vapor) Did you know? Water exists on earth in three matter states states.
Proteins are made from long chains of amino acids. A(n) protein is formed when amino acids are linked together in a long chain.
BRASS An alloy of copper and zinc. Brass alloy is made from copper and zinc.
Only boiling, or a sophisticated filtration system, can kill or remove human pathogens such as giardia and leptospirosis. Water can be boiled to kill giardia and most other pathogens.
The “knee-jerk" motion that people involuntarily perform after being struck in the knee in a certain way is an example of what kind of behavior?
In which way to vertebrates reproduces?
The love canal tragedy was an infamous example of industrial waste dumping.
Why is respiratory acidosis considered to be problematic?
Because the density of the wood is less than water, it will float in water. Density allows cut logs to float on water.
Metallic solids are composed entirely of metallic atoms.
Which action forms a different chemical substance?
You call cellular respiration that does not need oxygen to proceed anaerobic respiration.
What illnesses are caused by damage to the alveoli of the lungs?
A galaxy is best described as a cluster of
Sliding friction is friction that acts on objects when they are sliding over a surface.
A(n) cell is the lowest level of organism that can perform all activities required for life.
The sun is at the peak of an 11-year cycle of solar flare and sunspot activity. Sunspots occur in a 11 year cycle.
What is the term for an organism, or single living thing?
An equivalent term for an autotroph is producer . Autotrophs is another name for producers.
Metallic bonds hold together positive metal ions and their valence electrons.
Causes of Skin Cancer Excessive exposure to sunlight is the single most important factor associated with skin cancers on the face, eyelids, and arms. Sunlight is the leading cause of skin cancer.
What energy is stored in a person or object?
Seed dormancy ensures that seeds germinate only when conditions for seedling survival are optimal.
The creation and destruction of oceanic crust is the reason what moves?
Photoautotrophs capture light energy, and use carbon dioxide as their carbon source.
What is the first stage of cellular respiration?
What the scientific concept stating that when looking at two competing theories, the one with fewer assumptions should be chosen?
The brain stem controls a number of unconscious activities such as heart rate, breathing, and others. The brain stem regulates the rate of breathing.
What causes waves to bring sand up onto the beach during summers?
Y Yeast Single-celled micro-organism which brings about fermentation. Single-celled are yeasts.
How do scientists know that some mountains were once at the bottom of an ocean?
This tube, known as a Phanotron Diode, was filled with a noble gas such as argon, or neon. Neon is an example of noble gas.
The amniotic sac, which was sitting on top of the flat embryo, envelops the embryo as it folds.
How many different main types of diabetes are there?
In physics, work means the use of what to move an object?
What type of feedback intensifies a change in the body’s physiological condition rather than reversing it?
The cell starting meiosis is called a primary oocyte. The cell starting meiosis is called a primary oocyte.
When it rains, some animals will move to seek shelter.
The food vacuoles travel through the cytoplasm and are digested, with the molecules eventually passing into the cytoplasm, and wastes being expelled from the cell by exocytosis . The cell expels waste and other particles through a process called exocytosis.
A student should use a balance to compare the masses of two small rocks.
The first leaves of most ferns appear curled up into fiddleheads.
When a metal and nonmetal form a compound, most often the nonmetal attracts electrons more strongly than the metal (i.e., it has a larger electronegativity). Nonmetals have the highest attraction for electrons.
Gastric emptying is regulated by both the stomach and the duodenum.
Ventricle The heart has four chambers. There are four chambers in the heart.
A sign that an apple tree is going to start growing apples is when the tree has
All cells have the small size in common.
Deletions remove one or more nucleotides from the dna
Ozone is a compound formed when there is sparking electrical equipment.
A mineral is described as a natural substance that makes up rocks.
Volcanic gases helped create earth's atmosphere, and continue to affect its composition today. Volcanic gases helpe to form the atmosphere on earth.
What kind of system do echinoderms possess?
Light passes into the eye through the pupil, the choroid coat ensures that little of the light entering the eye is reflected back so the pupil normally looks black. The pupil is the name of the black opening in the eye that lets light enter.
A wedge is the name for a simple machine that consists of two inclined planes.
The angiosperms are the flowering plants. Angiosperms is the term for flowering seed plants.
What do you call materials that have high resistance to electric current?
A watershed, or drainage basin, is the entire land area that drains into a particular body of water, like a lake, river or estuary. All of the land drained by a river system is called its basin, or the "wet" term watershed
Type 2 is the more common type of diabetes.
The heterotroph eats only or mainly plants.
For social animals, communication essential.
Hormones send signals through your body.
In which way are evaporation and condensation similar?
Weeds are plants that grow where people don't want them to and can take up space and use resources which hinders growth of more desirable plants.
Heterotrophs are all organisms that obtain their food from the environment. Because all animals require an external source of food, they are called heterotrophic.
What is responsible for the properties of metals?
Soil, for human purposes, is a(n) nonrenewable resource.
Most growing plant cells expand through water uptake.
Electrons always result in what?
Fluid is the term for a state of matter that yields to sideways or shearing forces.
alternating current (AC) An electric current that reverses its direction at regularly recurring intervals. Alternating current is the term for electric current that keeps reversing direction.
The decay rate is measured in a unit called the what?
Gas bubble holes helps pumice float in water.
If two populations do not mate and produce fertile offspring, separate species result.