Darwin hypothesized that favorable traits spread through as species as

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.

What would happen if the krill were removed from the food web

In the diagram below, the northern hemisphere would be in what season at position a a.fall b. winter c.summer d.spring