The secretion of tears, milk, saliva, and earwax is a
function of what tissue?
a. epithelial
b. loose connective
c. lymphoid
d. nervous
e. adipose
Answer: a
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A substance that promotes binding of Rhizobium to plant root hairs is called a ________ factor.
Fill in the blank(s) with the appropriate word(s).
What is true about the half-life of 14C?
A. The half-life never changes over time. B. It takes 5,730 years for half of 14C to be converted to 14N. C. It can be employed in the radioisotopic dating of fossils. D. All of these are correct.
The most commonly reported sexually transmitted disease in the United States is caused by the bacterium ____.
A) Mycoplasma genitalium B) Chlamydia trachomatis C) Chlamydophila proctitis D) Ureaplasma urealyticum
In terms of number of species, the most successful terrestrial vertebrates that invaded the air are
A. flying monkeys. B. birds. C. bats. D. pterosaurs. E. insects.