Conclusions .

a. are experimental factors which do not change
b. can only be made if the hypothesis is proven true
c. are made from careful analysis of data
d. are formed before the experiment begins

What is thought to have caused the mass extinction at the end of the cretaceous period?

Which statement about the immune system is false? a. lymphocytes reduce inflammation, b. b cells remember specific pathogens. c. most white blood cells kill bacteria d. white blood cells are made in lymph nodes.

Is a measure of the different types of organisms in a community. question options: tertiary secondary primary none of the above