What is cross-pollination?
a. cross-pollination involves human transfer of pollen from one flower to another.
b. cross-pollination occurs when pollen fertilizes female egg cells on the same flower.
c. cross-pollination results in a flower having only one plant as a parent.
d. cross-pollination occurs when pollen from the flower on one plant fertilizes the egg cells of a flower on another plant.

Why is excretion necessary to maintain homeostasis?

In a classic experiment using pea shape, mendel conducted two separate genetic crosses. in the first cross the parent plants were “true breeding” for pea shape; one had round peas ( r )and the other had wrinkled (r). the first cross produced a filial 1 generation of all round peas. in the second cross, mendel bred plants from the filial 1 generation. this cross produced different results. out of approximately 1000 plants, about 75% were round and 25% were wrinkled.

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.