The relationship least commonly found in nature is a. commensalism b. symbiosis c. parasitism d. predation

It is letter B. Symbiosis

Symbiosis, a Greek word means living together. It is a specified class of a close and a long period of time natural interface between two different biological creatures – commensalistic, mutualistic, or parasitic.

Symbiosis can be necessary, which means that one or both symbionts completely depend on each other for existence and endurance, or either way they can generally live independently.

the aorta is the large artery leaving the heart branches into smaller arteries, which eventually branch into capillaries.the arteries carry oxygen and nutrients away from your heart, to your body's tissues. the capillaries are small, thin blood vessels that connect the arteries and the veins. the statement that arteries carry oxygen-rich blood to capillaries is true. veins on the other hand are blood vessels that take oxygen-poor blood back to the heart.

absolute strength refers to the maximum force exerted by a body irrespective of body size. relative strength on the other hand is the force exerted by a body in relation to muscle size or body weight.

so the answer is: c. absolute strength measures strength regardless of your body size, while relative strength measures strength adjusted for your weight.