Can I get treated for an STD while Iâm pregnant? It depends. STDs, such as chlamydia, gonorrhea, syphilis, trichomoniasis and BV can all be treated and cured with antibiotics that are safe to take during pregnancy. STDs that are caused by viruses, like genital herpes, hepatitis B, or HIV cannot be cured.
Explain how multicellular life evolved from unicellular life. The first evidence of multicellularity is from cyanobacteria-like organisms that lived between 3 and 3.5 billion years ago. In order to reproduce, true multicellular organisms must solve the problem of regenerating a whole organism from germ cells (sperm and egg cells), an issue that is studied in developmental biology. Therefore, the development of sexual reproduction in unicellular organisms during the climax Mesoproterozoic is thought to have precipitated the development and rise of multicellular life
For most of Earth's history, evolution has been a slow progression. The Cambrian Explosion, however, was a rapid evolution period starting 542 million years ago. Life expanded from simple, single-celled organisms to every current phylum of life known today over the course of roughly 40 million years.