Alligators excavate holes in the bottom of bodies of water. During times of severe drought these holes act as refugia for various aquatic organisms that might perish if there were no water available. Thus, alligators in this system can be classified as a(n) Group of answer choices

This question lacks options: 1) keystone species. 2) symbiotic species. 3) sympatric species. 4) allopatric species. 5) refugistic species. The correct answer is 1) keystone species.

Explanation:

Keystone species are the species that have a more important effect on the ecosystem than expected for its low biomass, exerting a direct influence on the others, that is, a key species can have different effects on its ecosystem or on other species with those that cohabit. Among them are: Modification of the landscape, source of food, generators of shelter, altering ecological processes. This makes their presence very meaningful.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.

climate change and pollution