What do plants need to make chlorophyll

What is it when small lipid molecules are in high concentration outside a cell and they slowly cross the membrane into the cell?

The first step in restoring pine woodlands is prescribed burning. T or F

How do humans protect themselves from the sun

Cancer grading is based on a. metastasis. b. local invasion. c. cell differentiation. d. tumor size.

The boundary where air masses meet is a

How much time have organisms had to change?

Which winds are usually warmer and more humid? Winds blowing from the north Winds blowing from the south Winds moving from the land Winds moving toward the ocean

Phylogeny refers to a. the evolutionary history of a group of related organisms. b. a group of organisms that includes an ancestor and all of its descendants. c. Darwin's method to classify organisms. d. all of the above

Vertebrae protect the cerebellum. true or false

Which of these is NOT a way that large molecules, like glucose, can enter a cell? A) diffusion through the cell membrane. B) facilitated diffusion through protein channels in the cell membrane.