Which best describes cell theory
a. scientists know all there is to know about cells, so the cell theory will never change
b. as technological advances are made, cell theory may change
c. a theory once formulated cannot be changed
d. the development of a synthetic cell has caused the cell theory to change

Which type of respiration takes place when there is no oxygen present

Food webs - transferring energy and matter from one level to another. here you see four food webs. one or more are incorrect. which food web(s) show the correct sequence of organisms, from start to top level consumer? a) a b) d c) c d) a and d

How does the diagram explain ocean currents? earth tilt 23.5 degreesquestion 1 options: earth's tilt causes uneven heating of earth which causes currents.earth's tilt causes the ocean to move because of gravity.earth's tilt and its rotation cause currents.earth's tilt causes uneven distribution of salt which causes currents.