What is the role of DNA in controlling cellular activity? * O DNA provides energy for all cell activities
O DNA determines which enzymes are produced by a cell
ODNA is used by cells for the excretion of nitrogenous waste
ODNA provides nucleotides for the construction of plasma

How many species of living things are alive on earth today? more than 1,000,000 none of these answers are correct 100-500 1,000 –500,000 o 500,000 -1,000,000

The diagram shows the development of the oocyte and the follicle during the menstrual cycle. identify at which stage in the cycle the hormone levels are at their highest and most active.

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