You find an animal that has a flexible cuticle, longitudinal muscles, a complete digestive system, and a false coelom
What is its most likely identity?
a. a nematode
b. a cnidarian
c. a flatworm
d. an echinoderm
e. a sponge
ANSWER: a
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The chorionic villi eventually form the placenta, a disc-shaped structure that ____
a. releases sex hormones at appropriate times throughout pregnancy b. initiates uterine contractions c. binds to the zygote to accelerate organ development d. nourishes the embryo throughout pregnancy e. prevents infection by blocking the passage of microorganisms through the cervix during pregnancy
Which of these terms could be used to describe a person with one normal gene and one gene for a
recessive disease? a. heterozygote b. carrier c. a female d. a male e. homozygote
World human population in 2017 was approximately
A. 7 billion. B. 8.5 billion. C. 10 billion. D. 7.5 billion. E. 800 million.
Which of the following would be characteristic of a plant exhibiting shade avoidance?
a. stem elongation b. more leaves c. higher quantity of storage products d. more reproductive tissue e. more branches