The correct answer is D. They do not have a cellular structure.
I would look inside the nucleus (B) - that's where DNA is located. It's also called nuclean DNA because of this. The DNA is found in Chromosomes, which are kind of "packages" of DNA.
A niche is a specie's function in its habitat or its level on the food chain, so two species competing at the same level for the same food and habitat eventually one species will have to migrate or starve due to lack of food.
Answer: Genes are segments of deoxyribonucleic acid (DNA) that contain the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person's genes. Genes are contained in chromosomes, which are in the cell nucleus.
Explanation: