The need for natural resource should increase.
Answer:
The egg contains both food and mitochondria in addition to its vital DNA, thats why it is much larger. The sperm cell has to be much smaller than the egg cell, because it is the one that swims. If a sperm cell were as big as an egg, it would not be able to move very fast nor very far.
D. A plant using sunlight to make good
D so that bacteria doesnt multiply in the grains since moisture favours them
I'm not for sure about it But i'm pretty sure it's D. Sorry if I'm wrong..