Compared to the numbers of grasshoppers or deer, there are few mountain lions. The reason that large and fierce animals, such as the mountain lion, are rare in an ecosystem is that
Select one:
a. such animals do not tolerate other members like them.
b. through evolution, most fierce animals have been killed off by others.
c. food chains are only 10-20% efficient at each step and top carnivores require large amounts of calories for their survival.
d. only a few such animals are permitted by succession in a biome and there are only a few biomes.
e. more large predators bring more disease to an ecosystem.
c. food chains are only 10-20% efficient at each step and top carnivores require large amounts of calories for their survival.
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Mendeleev found that when he arranged the known elements according to their atomic mass, the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements. This led to the generalization now known as:
A. an atomic model. B. valance electrons. C. the periodic table. D. the octet rule.
In biological nitrogen-fixation, ____
a. ammonia is converted to nitrogen gas b. nitrogen gas is converted to ammonia c. ammonia is converted to nitrate d. amino acids are linked into proteins in ribosomes e. nitrate is converted to ammonia
Plasmodium reproduces by binary fission.
Answer the following statement true (T) or false (F)
A disease is called an epidemic if people all over the world have the same disease.
Answer the following statement true (T) or false (F)