Eric is studying primary growth in plant roots. which part of the plant root should he observe

I’m stuck on this question cuz i’m stupid sksksksk

When a human or animal consumes food, the carbon in that food is most likely to be converted into which of the following elements? a. carbon remains carbon b. nitrogen c. oxygen d. hydrogen

Substances that can pass through cell membranes by diffusion include a. na ions. b. proteins c. glucose. d. oxygen.