Which homeostatic process moves particles against a concentration gradient?
a. dynamic equilibrium
b. passive transport
c. osmosis
d. active transport

Aresearcher has developed two stains for use with seed plants. one stains sporophyte tissue blue; the other stains gametophyte tissue red. if the researcher exposes pollen grains to both stains, and then rinses away the excess stain, what should occur? a) the pollen grains will be pure red. b) the pollen grains will be pure blue. c) the pollen grains will have red interiors and blue exteriors. d) the pollen grains will have blue interiors and red exteriors.

The cluster of developing cells from conception until birth is called an

What best describes the dropping height of a ball that bounces back up to a height of 45 cm