A typical amniote has ____, but fish do not
a. a backbone
b. waterproof skin
c. gills
d. external fertilization
e. a cartilaginous skeleton
ANSWER: b
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Indicate whether the statement is true or false.
Answer the following statements true (T) or false (F)
1. Damage to the seminal vesicles would prevent sperm from becoming motile. 2. Erectile dysfunction can be treated by drugs that increase levels of nitric oxide. 3. FSH stimulates the activity of Leydig cells and LH stimulates the activity of Sertoli cells. 4. A human female has the largest number of primary oocytes at the onset of puberty. 5. FSH secreted by the pituitary stimulates fluid secretion into the antrum of the follicle.
The hierarchy of life extends past individual organisms. Which of the following is the correct sequence, from least inclusive to most inclusive, following an individual organism?
A. population - ecosystem - community - biosphere B. community - population - ecosystem - biosphere C. population - community - ecosystem - biosphere D. community - population - biosphere - ecosystem E. ecosystem - population - biosphere - community
Type II survivorship curves ____.
A. are characteristic of humans and elephants B. indicate a fairly constant rate of death at all ages C. indicate a high mortality rate in the very young D. are characteristic of species in which most individuals live a relatively long life and die of old age E. are typical of species with high biotic potentials