Avirus that, upon infection of a host cell, makes a dna copy of its rna and inserts that piece of dna into the cell’s genome is called a(n)
a. prophage.
b. bacteriophage.
c. endospore.
d. retrovirus

Which phrase best describes surface currents? 1. up-and-down ocean movement caused by wind 2. waves that hit the shore at an angle and transport sand 3. streams of warm water flowing through the ocean and caused by wind 4. waves that approach the shore and cause their crests to fall into their troughs

Why do german shepherds shed so much

Out of the seven main animal groups (fish, mammals, birds, insects, reptiles, amphibians, and arachnids), how many contain members with internal backbones? a. 5 b. 3 c. 7 d. 1