What is a keystone species? 
A species that is very important to the health of a specific ecosystem

A species with a exterior shell such as turtle

A species that typically build its shelters out of a stone

A species which helps unlock new areas of an ecosystem by removing stones

How many major plates cover the earth

What would most likely happen if green plants were exposed to longer days of sunlight? a. the mitochondria would produce less energy . b. the chloroplasts would produce more energy. c. the cell wall would become thicker. d. the vacuoles would quickly shrink.b. the chloroplasts would produce more energy.

What are the characteristics of subsystem