Clownfish live within the tentacles of sea anemones. The anemone protects the fish from predators, and the clownfish cleans the anemone. This relationship is an example of
A) parasitism. B) predation. C) succession. D) mutualism. E) competition.
D
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The surface area of a plant's root system is substantially larger than the surface area of its shoot system. The extensive surface area of roots is an adaptation associated with _____
A) contact with soil particles for mineral and water absorption B) the internal structure of the vascular tissue in roots C) the storage of nutrients within the root system D) the release of carbon dioxide generated by photosynthesis
Which of the three genes is in the middle?
Females heterozygous for the recessive second chromosome mutations px, sp, and cn are mated to a male homozygous for all three mutations. The offspring are as follows:
A) px
B) sp
C) cn
D) insufficient data
Many studies on genetic variation in humans have been done with the perception of taste. The chemical phenylthiocarbamide (PTC) has been used extensively in these studies
Although many individuals cannot taste PTC, many individuals find the taste of PTC to be ________. A) umami B) salty C) sour D) bitter E) sweet
_____ is known as a cardiac pacemaker.
A. Diastole B. Systole C. Cardiac muscle D. SA node E. AV node