Francine is developing a model of the carbon cycle, which involves the movement of carbon among various Earth systems. She begins by drawing the diagram shown below. In addition to the movement of carbon through Earth’s systems, Francine also wants her model to show how much carbon is stored in reservoirs or sinks. Which of these aspects of the carbon cycle could she add to her model to start building a more quantitative model? A.
The process of photosynthesis moves carbon from the atmosphere to the biosphere.
B.
About 550 gigatons of carbon is stored in plant biomass.
C.
The ocean is the greatest carbon sink, storing about 38,000 gigatons of carbon per year.
D.
Geologic processes such as eruptions move carbon from the geosphere to the atmosphere.

answer: decrease

a limiting factor is the one which decrease the abundance, distribution and causes extinction of the population of species in a ecosystem. here, predators including hawks, owls and snakes are the limiting factor for the population of mexican free tailed bat.   although bats are nocturnal animals as they forge for food at night these predators also may remain active during night which can decrease the population of the mexican free-tailed bats. also, these bats eat only one type of insects that are moths. the food can also be a limiting factor as all 400 members are dependent upon same type of food needs that are moths. the decrease in the moth population can cause decrease in population size of the mexican free-tailed bats.

therefore, the scenarios will most likely to decrease the population size of the mexican free-tailed bats.  

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this

c. heat from the poles back down towards the equator.

d. groundwater flows through the subsoil and deposits minerals.