Which best describes a scientific theory? * A) A well-established and highly reliable explanation of a phenomena or situation.
B) Based on many many observations and investigations over time
C) A casual idea
D)Both A and B

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

What part of the brain is highlighted in the diagram below?

Natural resources are any materials that humans obtain from the earth to meet our wants and needs.