According to cell theory, viruses are considered nonliving because they
a)
do not contain organelles.
b)
do not contain organic compounds.
c)
cause diseases in other organisms.
d)
lack the ability to reproduce without a host.

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

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.

Is there any solid scientific evidence that humans have been cloned?