Ellen grabs a topsoil sample in her hand. she rolls it into a ball. the soil feels gritty and the ball falls apart. what part of the topsoil most likely made the topsoil feel gritty? a-clay b-sand c-silt d-humus

Amylase is an enzyme found in the human digestive system. why do you think it was important to keep the enzyme temperature about 37 degrees celsius (98.6 degrees f)? describe what might happened the temperature decreased by 10 degrees celsius.

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above

The climate on the leeward side of a mountain differs from that on the windward side mostly in