What two organ systems regulate other organ systems to maintain homeostasis, the maintenance of a
stable internal environment?

The Endocrine system and Nervous system

Explanation:

Homeostasis is the process of maintaining the internal environment of the body. The body regulates it's internal environment using the endocrine and nervous systems with various organs involved such as, lungs, kidneys, skin, pancreas. Temperature, blood sugar levels, oxygen and carbon iv oxide concentration, urea and other metabolic waste are examples of substances that the body needs to keep in control. The endocrine system is the system which are collection of glands that produce hormones needed for various regulatory purposes. This system consists of pituitary, thyroid, parathyroid, adrenal glands, pancreas. The nervous system responses to the various stimulus by causing the endocrine system to produce it's hormones for the appropriate response. For instance, when the level of water in the bloodstream becomes low, the hypothalamus (nervous system) in the brain release an hormone called antidiuretic hormone (ADH), the ADH stimulates th kidneys to absorb water through water channels and vice versa when there is excess water in the bloodstream.

thats how its supposed to be

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.