Answer:
The correct answer would be d. wild-type.
Wild type refers to the gene, strain, or character which is most commonly found in the population in natural conditions.
The allele or the gene which is found rarely in the population is termed as mutant allele or character.
For example, the wild-type phenotype of fur color of tigers is orange with black strips whereas the mutant phenotype would be a white coat with black strips.
Answer:
See the answer below
Explanation:
Person X is feeling a burning sensation in several muscles<u> because of the accumulation of lactic acid due to inadequate oxygen in their system.</u> When oxygen becomes inadequate during exercises, anaerobic respiration takes place to augment the oxygen shortage and this leads to the production of lactic acid which accumulates up in the muscles and gives a burning sensation.

Person Y does not feel any burning sensation in their muscles <u>because oxygen is adequate in their system and they do not need to respire anaerobically.</u> <em>Person X exercise regime must have been more rigorous than that of person Y.</em>
Carbohydrates.............
All living organisms are composed of one or more cells.
The cell is the basic unit of structure and organization in organisms.
Cells arise from pre-existing cells.