More Harmful Effects of Smoking Weed While Breastfeeding. More medical studies need to be done to determine marijuanaâs effects on breast milk, but below are some of the areas studies have indicated contain risk factors.urthermore, marijuana use can diminish the abilities of a mother to take care of her newborn. The American Academy of Pediatrics advises nursing mothers not to use marijuana while breastfeeding. However, in some states medical marijuana is used to treat anxiety and other medical conditions.
We can see fossils of many other reptiles in rock of the same age and even older, but Archaeopteryx lithographica is the oldest known fossil to have feathers. We conclude that this animal is a link between reptiles and birds and that birds are descended from reptiles.ossils can be used to recognize rocks of the same or different ages. The fossils in this figure are the remains of microscopic algae. The pictures shown were made with a scanning electron microscope and have been magnified about 250 times.
A: Index fossils are fossils that are found often in many different areas of the world. These types of fossils help to date other fossils that have been found in the same sedimentary layer of the Earth. Index fossils are also known as indicator or zone fossils since scientists and archaeologists use them to identify geological periods and stages. They work on the notion that if one type of species lived on Earth during one time period, and if a fossil of said species is found in many different areas, it must be from the same geological area.