Long ago, scientists did not know that cells existed because
a) they did not have microscopes.
b) they were too busy studying plants.
c) they were not allowed to do research on animals.

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.

Explain how ancient whale fossils found in eqypt are believed to support the theory of evolution.

Name the organs of humanelemintary canal.