Hominins evolved when the climate was ____.
A. wet and hotter
B. wet and cooler
C. dry and hotter
D. dry and cooler
E. similar to today
Answer: C
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Histones and DNA have a strong attraction for each other because
A) DNA is positively charged and histones are negatively charged. B) both DNA and proteins are hydrophobic. C) DNA is negatively charged and histones are positively charged. D) like substances share common charges.
All mammals have mammary glands.
a. true b. false
The free-swimming adult stage of many cnidarians that reproduces sexually is a
A. larva. B. polyp. C. medusa. D. zygote.
Both mosses and ferns "show their aquatic ancestry" because they:
A) require water for egg laying. B) typically require water for sperm delivery to the egg. C) lack a water-repellent cuticle. D) have roots that must remain wet at all times.