They decrease because the zebra mussel were taking their resources. Leaving them nothing to eat.
B. the inner core has a higher temp than the outer core and the pressure is greater for the inner core witch makes it a solid. I'm not the smartest bean out there but I hoped this helped
Natural Selection could produce new variations of body parts.
Reproductive isolation must happen
Ecosystems can be large and are made of biomes. Some examples of ecosystems are deserts and forests.
