When the hazard factor is low, individuals tend to reproduce:
a. more often.
b. earlier in life.
c. only during particular seasons.
d. later in life.
e. less often
Ans: d. later in life.
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At an atmospheric pressure of 870 mm Hg with 21 percent oxygen, the partial pressure of oxygen is _____
A) 100 mm Hg B) 127 mm Hg C) 151 mm Hg D) 182 mm Hg E) 219 mm Hg
Scientists recently cloned Louis Pasteur and put him back to work in a modern lab. He promptly developed a gel that breaks down proteins. Since he hasn't been around for some time,
he's unsure what the best application for his invention might be. Help him out. What pathogenic item in this gel would be most effective and safe at eliminating? A. Viroids on the surface of agricultural plant tissues B. Prions inside the central nervous system of cows C. Viruses on the surface of the skin D. Bacteria in the intestines of human beings E. The fungus that causes athlete's foot between people's toes
In comparing all three major muscle types, which one of the following statements best describes the differences between them?
A) Cardiac muscle can be stimulated only by nerves, whereas smooth and skeletal muscle contract spontaneously. B) Smooth and skeletal muscles appear striated, due to the arrangement of muscle filaments, whereas cardiac muscles lack these filaments. C) Only cardiac muscle is under voluntary control. D) Smooth and cardiac muscle do not fatigue, whereas skeletal does fatigue. E) Gap junctions are present in skeletal muscles, but not in other types of muscle.
Arrange the following structures, which can be found on male pine trees, from the largest structure to the smallest structure (or from most inclusive to least inclusive)
1. sporophyte 2. microspores 3. microsporangia 4. pollen cone 5. pollen nuclei A) 1, 4, 3, 2, 5 B) 1, 2, 3, 5, 4 C) 4, 1, 2, 3, 5 D) 4, 3, 2, 5, 1