<span>Most children acquire a firm sense of gender identity by the age of three</span>
Adaption, evolution, variation are all causes of natural selection.
hope this helps..
brainliest..?
Photosynthesising primary producers require sunlight. Therefore, in the ocean, phytoplankton would be concentrated within the surface layers of the ocean where the sunlight penetrates. Phytoplankton support a wide range of marine life: zooplankton feed on phytoplankton, which in turn support fish and so on.
I think it's d but I'm not sure!!
To part A the answer is continental drift :D to Part B the answer is Mid-ocean ridges :D Hope I was helpful
