Four students write a description of the cell membrane. Student 1: The cell membrane controls reproduction and is found only in plant cells, Student 2: The cell membrane controls what enters and exits the cell and is found in

all kinds of cells.

Student 3: The cell membrane produces proteins and is found only in animal cells. Student 4: The cell membrane produces carbohydrates and is found only in

prokaryotic cells.

Which student's description is correct?

A. Student 1

B. Student 2

C. Student 3

D. Student 4

ur answer is e & d

explanation:

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]