________ tissue is the outer protective covering of the plant.
Fill in the blank(s) with the appropriate word(s).
Dermal
Dermal tissue is the outer protective covering of the plant.
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An organism at the top of the food chain:
A. has no natural prey B. has no, or very few, natural predators C. experiences no selection pressures D. is not subject to evolutionary changes
The perception of a certain pitch of sound depends partly on which of the following?
A. the amplitude of the sound waves B. which bones of the middle ear are moved C. which hair cells of the cochlea are stimulated D. where particles settle in the semicircular canals E. whether it is the round window or oval window that vibrates
Which type of media is designed to support the growth of one group of organisms, but not another, by containing antimicrobials, dyes, or alcohol?
a. Selective b. Nutritive c. Differential d. Definitive
How are humans able to produce billions of unique B and T cell receptors?
a. Each time a pathogen is encountered, a new receptor is produced. b. The two different genes that encode receptor proteins, allow for many versions of receptors to be produced. c. Random splicing of gene segments encoding receptor proteins allows for 2.5 billion potential combinations. d. Antigen presenting cells stimulate B and T cells to each produce billions of receptor molecules. e. There are billions of B and T cells, each of which produces a single receptor on its cell surface.