Which of these is an example of active immunity? a. a pregnant woman passing antibodies to the fetus across the placenta b. a pregnant woman giving antibodies to an infant through breast milk c. a person developing antibodies against the measles vaccine d. a person receiving antibody shots after being bitten by a rabid animal

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.

The frequency of alleles in a population that is in hardy weinberg equilibrium? a . changes in each successive generation b. is less important than the frequency genotypes c. shows evidence of the process of natural selection d. remains the same over several generations

As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet?