An element can have multiple isotopes. Each of the different isotopes of the same element has a different:

a. number of electrons

b. number of protons

c. mass number

d. atomic number

Which of the following statements best describes one role of water in living organisms?

The activity of two enzymes, pepsin and trypsin, are shown here. These are two enzymes involved in the digestion of food in the stomach and small intestine. At which pH would the activity of both enzymes have the same catalyzing rate? Submit

The upper forelimbs of humans and bats have fairly similar skeletal structures. T/F

Do all scientists accept the finding of a new species?

A saclike structure in which cells store materials is called

8. List at least 5 new discoveries about viruses.

The phospholipid molecule has two parts, the polar end and the bipolar end. True or False?

Giraffes use their extremely long necks to reach the lees high up on a case he had trees which other animals can not reach giving them a food source for which they have few competitors what can you conclude about natural selection from this

Which is a reason that many organisms that have existed on earth have left no fossils?

Are all organisms with similar physical characteristics related to one another? If not, why?