True or false: The developing fetus is most vulnerable to toxins, drugs, and infections during the first trimester of pregnancy because all of the basic structures and organ systems develop during this time
A. true
B. false
A
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Which of the following lists the structures of the male reproductive tract in the proper order from sperm production to ejaculation?
A. seminiferous tubules, epididymis, vas deferens, ejaculatory duct, urethra B. seminal vesicles, vas deferens, prostate, urethra, ejaculatory duct C. vas deferens, epididymis, seminiferous tubules, ejaculatory duct, urethra D. vas deferens epididymis, seminal vesicles, ejaculatory duct, urethra E. epididymis, seminiferous tubules, ejaculatory duct, vas deferens, urethra
Which of the following best describes fertilization in the fern life cycle?
a. Pollen is blown by the wind to a female cone, where it forms a pollen tube that grows toward where the egg will form. b. Flagellated sperm swim in a film of water on the surface of the plant to reach an egg. c. Flagellated sperm are blown by the wind to a location near an egg, and then swim through plant fluids to reach the egg. d. Flagellated sperm swim through plant fluids to reach an egg. e. Flagellated sperm attach to the moist skin of certain animals and are transferred to the surface of the plant to reach an egg.
Which of the following is an example of artificial selection?
A) Green tree frogs that blend perfectly into their leafy surroundings B) The many different breeds of domestic cats C) The many different species of Oak trees found in the forest. D) Cheetahs that can outrun their prey E) All of the above
The first vertebrates appear in the fossil record during the
A. Cambrian Period. B. Carboniferous Period. C. Triassic Period. D. Devonian Period. E. Proterozoic Era.