It appears that eukaryotic diversity took off around 800 million years ago. Which of the following is thought to be responsible for this?
A. By 800 million years ago, enough time had
passed since the arrival of eukaryotes for
evolutionary adaptation to take place.
B. Eukaryotic organisms first arrived 800
million years ago, so when they did, they
quickly diversified.
C. Chloroplasts first arrived 800 million years
ago.
D. Environmental conditions changed 800
million years ago, namely an increase in
oxygen and a decrease in sulfide.
E. All of the answer options are correct.
D
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Why are mitochondria so prevalent in skeletal muscle?
A) They give the muscle enough elasticity to contract. B) They are needed to repair damaged tissue that accumulates during exercise. C) They are needed to provide energy for muscle contraction. D) Bones and muscles require a great deal of energy to prevent them from separating. E) The flow of blood is greatest in skeletal muscle.
The subatomic particle(s) with a negative charge
is(are) a. the neutron. b. the proton. c. the electron. d. both the neutron and proton. e. both the proton and electron.
Specialized cells found at the base of the epidermis that produce pigments that help give skin its color are called ________
A) melanin B) melanocytes C) basal D) lacunae
List the main differences between protostomes and deuterostomes. What will be an ideal response?