<span>The only traits that can be acted upon by natural selection are those that are controlled by ___________________</span>
Answer:
A trait is most likely to exhibit continuous variation if it is controlled by <em>many gene loci, each with several possible alleles.</em>
Answer:
B) Digestion is the process of breaking down food into smaller molecules.
Explanation:
<span>The correct answer is d. increase the rate of breathing.</span>
<span>
Peripheral chemoreceptors (the carotid and aortic bodies) can sense hypercapnia (high CO2) and then they send a signal to the breathing centre. Breathing centre is in medulla oblongata which regulates breathing movements. When CO2 reaches a certain level, a signal is sent to trigger an inhalation and the rate of breathing is increased.</span>
The scientist credited with being the first person to observe bacteria and call them as small animalcules is B. Anton van Leeuwenhoek.
