What is a source of sediment? fragments of other rocks

chemicals and minerals dissolved in water

sea shells

all of the above

Acell in the human nervous system whose primary function is to form myelin and the blood-brain barrier, respond to injury, remove debris, and enhance learning and memory is called a(n) cell.

How many chromosomes does each human cell contain? a. 23 chromosomes b. 26 chromosomes c. 43 chromosomes d. 46 chromosomes

Dna replication or repair occurs in a cell in all of thw following situations except when