Answer:
I believe the answer is A
Explanation:
The other reasons would not give enough reason for competition between populations.
Sarah should found a Gills when she observes closely and dissecting the organism. A gills is what species in the water use for breathing, when people or human have lungs to breathe, fish or underwater species use gills to breathe in water. It is a respiratory organs of animals especially fish.
C) electrician
((ignore this brainly wants 20+ characters))
The most appropriate answer would be Winter !!
As in southermost past there is only two season winter and summer !! So as the earth is moving away from sun and thus the southern part will be far away and northern part will be facing sun !! So C !!
I am not totally sure but I think it might biosphere
