Middle of the "stellar spectral class" range of the H-R
A number of forces can cause gene mutations, such as smoking, radiation, viruses, cancer-causing chemicals (carcinogens), obesity, hormones, chronic inflammation and a lack of exercise.
Answer: Blood
Explanation:
Blood can transport nutrients, vitamins and minerals to the cells.
Answer:
The spongocoel, or interior of the sponge, is composed of walls perforated with microscopic pores that allow water to flow through the spongocoel. Researchers now think that the most likely candidate for this "Animal Eve" is the sponges.