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
A
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List the primary germ layers formed by gastrulation. What tissues will they form in the adult?
Endoderm: Mesoderm: Ectoderm:
Which of the following is an obligate intracellular parasite?
A. M. luteus B. S. pyogenes C. Rickettsia rickettsi D. Pseudomonas spp.
Lizards that eat flies they catch on the ground and birds that catch and eat flies in the air are engaged in _____ competition
a. exploitative d. interspecific b. interference e. both exploitative and interspecific c. intraspecific f. both interference and intraspecific
A group of organs in the body that have a common function make up a(n) ________
A) organism B) brain C) organ system D) tissue