The term tetrapod refers to amphibians, reptiles, birds and mammals
a. true
b. false
Answer: b. false
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How do ray-finned fish keep from sinking?
a. they are constantly swimming b. their fins are constantly moving c. they have lungs that are always filled with air d. they have a swim bladder that is filled with gas e. they have a skeleton that is less dense than the surrounding water
Which statement is false regarding schizophrenia?
a. The genes responsible along with the environmental conditions have now been identified. b. The disorder is characterized by delusion, hallucinations, and abnormal social behavior. c. Exceptional creativity is often associated with it. d. Affected individuals show altered gene expression in certain brain regions. e. Family trees point to a genetic basis.
Which of the following stages of embryonic development consists of only two layers of cells?
A. early gastrula B. morula C. late gastrula D. blastula
Which of the following causes mutations in DNA?
What will be an ideal response?