How can scientists use fossils
to see if a species has
changed over time?

What should be the strand of complementary dna produced by the strand of dna shown below cgt ata

Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. once a virus gains entry into the body, it invades a host cell in order to? a. synthesize antibodies for defense b. deactivate the host cell's defenses c. access cell processes for reproduction d. metabolize host proteins and grow

Which of the following requires the use of energy and the of transport proteins to move a molecule across a cell membrane?