Which of these facts is supported by the rock cycle?

a. limestone is a metamorphic rock.
b. metamorphic rocks are compacted sediments.
c. igneous rock can form from solidified magma.
d. metamorphic rocks are soft and crumbly.

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.

Why is excretion necessary to maintain homeostasis?

In a cladogram' when does a group of organisms branch off