In most animals, digestion occurs
A) intracellularly, through collar cells.
B) extracellularly, within the circulatory system.
C) intracellularly, through simple absorption.
D) extracellularly, within a cavity that is open at both ends.
E) extracellularly, within a gastrovascular cavity.
D
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What will be an ideal response?
________ is the second messenger associated with the regulation of blood pressure.
Fill in the blank(s) with the appropriate word(s).
With the advent of photosynthesis and the subsequent production of oxygen by photosynthetic organisms, most of the anaerobic organisms present on Earth became extinct because oxygen was actually toxic to these organisms
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