In a multicellular organism, the lungs are responsible for exchanging gases with the organism’s environment. Which cellular structure performs the same task for a cell?

This question lacks options; the options are:

A) chloroplast

B) mitochondrion

C) endoplasmic reticulum

D) plasma membrane

The answer is B. mitochondrion

Explanation:

The Lungs of multicellular organisms, as described in this question, is a respiratory organ that is involved with the INTAKE of oxygen needed for cellular respiration and EXPULSION of carbon dioxide out of the body, a process called GAS EXCHANGE.

This gaseous exchange function of lungs is carried out for the process of respiration which is carried out at the cellular level by MITOCHONDRION. Mitochondrion is an organelle in eukaryotic cells associated with the cellular respiration (release of energy).

The gaseous reactants (oxygen) and products (carbon dioxide) of cellular respiration is exchanged by the LUNGS.

answer: d. load

a river's load refers to the natural phenomena in which the sediments, rocks   stones, boulders and other deposits are removed and picked from the bottom bed of the river due to the abrasion resulted by the high speed water current.