4. Why do some marine scientists specialize in single-celled organisms? (1 poi A. There are very few species to choose from
B. Single-celled organisms are the least understood in the ocean.
c. Many of them are poisonous, so they endanger other creatures.
d. Single-celled organisms form the foundation of life in the ocean.
5. Chemical oceanographers often study pollution because (1 point)
A. most pollution occurs in the ocean.
B. pollution creates chemical changes.
C. no other field examines the implications of pollution
D. only chemical oceanography uses the scientific method.

Cells destroy body cells infected by a virus or bacteria.

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

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.