Which of the following affects the speed of a planet's revolution?

a. shape of the planet
b. gravity of the sun
c temperature of the sun
d. atmosphere of the planet

giving 20 points for answer.

List two limitations of natural selection

What type of specimens where you able to see under each of the microscopes in the microscope activity

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.