The endocrine system is directly involved with

Answer;

-Arousal, metabolism, growth and sex

The endocrine system is directly involved with arousal, metabolism, growth and sex.

Explanation;

The endocrine system is the collection of glands that produce hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood, among other things.

-These hormones regulate the body's growth, metabolism (the physical and chemical processes of the body), and sexual development and function. The hormones are released into the bloodstream and may affect one or several organs throughout the body.

-Hormones are chemical messengers created by the body, whose role is to transfer information from one set of cells to another to coordinate the functions of different parts of the body.

The answer is it effects metabolism.

Metabolism is the set of life-sustaining chemical reactions in organisms. The three main purposes of metabolism are the conversion of food/fuel to energy to run cellular processes, the conversion of food/fuel to building blocks for proteins, lipids, nucleic acids, and some carbohydrates, and the elimination of nitrogenous wastes.

the dark variety, as they are not visible on the dark tree barks

explanation: