Answer:
Ostia are tiny pores present all over the body of sponges. its function is to let the water, along with desire nutrient flows interior of the sponges.
<span>Luca Cavalli-Sforza is a geneticist who hypothesized that the skin-color change came late because previous people had complete vitamin D access to the foods that they are eating. But the moment they started farming, the main vitamin sources are reduced, making a larger gain of having light skin.</span>
The word- descriptions pair should be paired as follows;
- blood viscosity: the friction red blood cells encounter when moving past each other
- blood pressure: the force of the blood against the vessel wall.
- cardiac output: the volume of blood pumped out by one ventricle each minute.
