I'm thinking the brain. The brain produces hormones and chemicals that tell the body to grow. And you also need to think a lot when trying to survive, which is when the brain comes in handy.
<span>Natural selection leads to the survival of the population with the most complex traits. your answer is d.</span>
Inhibition is the phenomenon by which living or dead plant cells absorb water by surface attraction.
The bacteria that lives on the roots of plants is called nitrogen fixing bacteria.
This type of bacteria turns nitrogen gas into nitrogen compounds that plants can use - this can also occur by the action of lightening as the energy from lightning makes nitrogen react with oxygen in the air to give nitrates.
So the answer would be C, I think.
The answer is 4. Hope this helps