Deciduous trees drop their leaves in response to
A. cold weather.
B. the length of day.
C. how long they have been growing.
D. None of the above is true.
B. the length of day.
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The site on an enzyme that is designated for the substrate bind is called the ________.
Fill in the blank(s) with the appropriate word(s).
What shape park is preferable for minimizing edge effects?
A. square B. oblong C. linear D. jagged E. rectangular
Black widows spend their entire lives in their cobwebs, sitting and awaiting predators. When a
prey item stumbles into their web, they rush out quickly to subdue it but tend to fatigue quickly and cannot maintain high levels of activity for long periods. As a result, ____________________.
a. they have mostly fast-twitch muscles b. their muscles have high levels of myoglobin c. they need a constant supply of oxygen for fast contractions d. actin and myosin function without calcium
The antibody immune response is attributed to the action of
A) monocytes. B) T lymphocytes. C) B lymphocytes. D) neutrophils. E) macrophages.