Which statement about adaptation is correct?
A. Higher organisms are better adapted than lower organisms.
B. Adaptations arise because they are needed in particular environments.
C. The adaptive value of a trait varies as the environment changes.
D. Better-adapted organisms are more complex than are poorly adapted organisms.
Ans: C. The adaptive value of a trait varies as the environment changes.
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The diversity of protists has increased along with the diversity of animals and plants
A. true B. false
Which group of gymnosperms diverged first?
A. ginkos B. conifers C. gnetophytes D. cycads E. angiosperms
Which of the following statements concerning Down syndrome is FALSE?
a. Down syndrome involves nondisjunction. b. Down syndrome individuals have 47 chromosomes per somatic cell. c. Down syndrome incidence increases with increasing material age. d. Down syndrome individuals have an extra chromosome 22. e. Down syndrome is variable in expression.
In stratified epithelium, such as the epidermis of the skin, cell division occurs
A) in the cells at the base layer only. B) in the surface cell layer only. C) throughout all the layers. D) in the basement membrane only.