The prevalence of what mostly isotopic and radioactive element in a layer of soil from 65-66 million years ago indicates that the Dinosaurs were killed by an asteroid in the K-T event?

What is the name of the protein shell that surrounds a virus?

Which of the following items are associated with conjugation?

Primarily it is the changes in what viral structures that allow enveloped viruses like influenza to spread to new host species and new tissues?

When do the first vascular plants appear? (so that they can begin to grow upward from the ground). Hint: this is not when the first forests appear

Which of the following explains the similarity in form of the dolphin’s and the shark’s dorsal fin?

Which of the following methods is NOT a method used by bacteria to recombine their DNA to increase genetic diversity?

At what point do we see the earliest evidence for animal life?

What is the name of the region in a bacterium where the primary chromosome is stored?

Place the following steps of a viral infection in order (assume no lysogenic phase).