Which of the following are not biotic and abiotic factors in an ecosystem?
A). Water and air
B). Rocks and energy
C). Plants and animals
D). Cultural Components

Which plains area lies in both the united states and canada? altiplano central canadian shield coastal plains great plains

Why is it important that fibrin is insoluble in water?

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home.what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point