Which of the following differs when comparing the deep ocean to the intertidal zone?
•need for energy
•salinity
•the amount of sunlight
•reliance on phytoplankton

If bacteria are much too small to see, what is one reason why can we see colonies in the petri dishes that have plenty of food to eat after only a few days?

During an experiment, readings for blood pressure in a persons body were found to be constant . however , when he measured by a different blood pressure cuff , the readings differed by 15 points for each reading. this difference indicates that the results are

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.