Atoms with the same number of protons but with different electrical charges _____.
a. have different numbers of neutrons
b. have different atomic masses
c. are different ions
d. are different isotopes
e. have different atomic numbers
Answer: c. are different ions
Biology & Microbiology
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The ____ has a digestive tract
a. coral b. earthworm c. flatworm d. hydra e. sea anemone
Biology & Microbiology
Gap junctions are most plentiful in
a. striated muscle. b. the stomach. c. smooth and cardiac muscle. d. the brain. e. the spinal cord.
Biology & Microbiology
Which accessory digestive organ secretes both enzymes and hormones?
a. pancreas b. gallbladder c. liver d. duodenum e. stomach
Biology & Microbiology
List three major evolutionary changes that occurred in animals, leading to greater complexity and specialization.
What will be an ideal response?
Biology & Microbiology