Cells that are possess a single set of chromosomes

Cells that are haploid only possess a single set of chromosomes whereas diploid cells have two sets of chromosomes. Primary example of haploid cells are gametes or reproductive cells such as the spermatozoa and the ovum; in which in the event of fertilization would produce a diploid cell. 

Examples of diploid cells are somatic cells i.e. epithelial cells, connective tissue cells, neurons, etc. 

Cell that are Haploid posses a single set of chromosomes. Haploid describes a cell that contains a single set of chromosomes. In humans, gametes (sperms and eggs) are haploid cells that contain 23 chromosomes, each of which a one of a chromosome pair that exists in diploid cells. On the other hand, Human cells like skin, lung, kidney, etc are diploid, which means they have two sets of chromosomes (23 from each parent to make 46 chromosomes).

Gravitational force i believe

The answer is c) organisms that are sensitive to changes in temperature would die.