It is particularly important for plants to obtain nitrogen from
It is particularly important for plants to obtain nitrogen from ________.
a. | the atmosphere | |
b. | soils | |
c. | primary producers |
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_______ diversity is the raw material that generates adaptation in species.
a. | Genetic | |
b. | Ecosystem | |
c. | General |
To date, ________ of eukaryotic species have been identified and named.
a. | less than 20 percent | |
b. | more than 75 percent | |
c. | about half |
Lakes and ponds are heavily influenced by ________.
a. | stratification | |
b. | light | |
c. | channel size |
Precipitation is an important factor influencing the ________.
a. | distribution of biomes | |
b. | biodiversity of ecosystems | |
c. | distribution of populations |
Tropical rainforests have ________
a. | distinct seasonal changes in temperature and precipitation | |
b. | the most stable temperature and precipitation profile year round | |
c. | seasonal fluctuations in rainfall from summer and winter |
What is an endemic species?
a. | a species that is very rare and difficult to find | |
b. | a species that is native to a specific area, usually one with restricted geographical size | |
c. | species that were once a single species, but divided over the years due to geographical separation |
Cold water has more dissolved ________.
a. | oxygen | |
b. | carbon | |
c. | hydrogen |
Island ________ attempts to explain why certain isolated island chains are particularly species rich.
a. | biogeography | |
b. | hotbeds | |
c. | diversity |
Animals with aposematic coloration use color patterns to ________.
a. | warn off predators | |
b. | mimic a more dangerous organism | |
c. | blend in with their environment |
In a ________ relationship, one organism is harmed but rarely killed.
a. | commensal | |
b. | mutualistic | |
c. | parasitic |
What is fecundity?
a. | an organism reproduces once in its life then dies | |
b. | the potential reproductive capacity of an individual | |
c. | the life history of an organism |
In general, ________ organisms are more densely distributed compared to ________ organisms.
a. | larger; smaller | |
b. | more complex; less complex | |
c. | smaller; larger |