In males, what is the purpose of the urethra?
A) It provides passage from the body for sperm.
B) It produces sugars that sperm use for energy.
C) It contains the testes.
D) It fills with blood during sexual arousal.
A
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If you had a garden full of a variety of plants, you might notice that the only pollinators of a
plant called trumpet vines are hummingbirds. Can you anticipate anything about the appearance of these flowers? What is the advantage of having a single pollinator for your plant species?
What will be an ideal response?How do pancake tortoises protect themselves from predators?
a. Their coloration serves as a disguise. b. They emit an undesirable scent. c. They have large jaws with teeth. d. They puff themselves up and become wedged in between cracks in rocks. e. They retreat into their shell.
Environmental effects can result in
a. altered metabolic pathways. b. a gene mutating in different ways in different individuals. c. altered genotypes. d. a post-developmental environmental effect. e. altered phenotypes.
A fossil whose age is determined by radiometric dating would be considered very old if only the smallest amount of radioactivity remained
Indicate whether the statement is true or false