Aperson walks through the woods. a branch falls suddenly, almost hitting him, and his heart suddenly starts racing. what part of his nervous system causes his heart to race?

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.

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

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