A class of eight students measured the population of water fleas living at the edge of a large pond. This is the method each student used. 1. Put
some pond water in a white tray.2.Take a pond net and scoop at the edge
of the pond a few times.3.Empty the pond net into the water in the
tray.4.Count the number of water fleas in the tray. The photograph below
shows a student working. The students did not control some variables. Give
two variables the students should have controlled to make this a valid
method.

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the correct answer is:

a population changes in response to a change in the environment.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

answer: grassland biomes are closer to the equator and receive more rain.

grasslands are biomes that are dominated by grasses rather shrubs and trees. savanna are biomes that exhibit grasses, shrubs and small tree as vegetation. grasslands are located near the equator of the earth. these are found in north america. savanna biomes are found in africa, south america, australia and india. grassland exhibit moderate climatic conditions, it receives   amount of rainfall higher than savanna.   therefore, savanna exhibit dry and hot climatic conditions.