Chemical signal can signify the lymphatic, nervous and endocrine system.
Mostly endocrine, the endocrine system is the body system responsible for providing the needed hormones for the body. These hormones and body fluids contribute and catalyse the growth, disposition, sex characteristics and other potential corresponding output of these hormones.
Answer:
H20
Explanation:
They are both water and carry oxygen for animals
Answer:
<h3>sand is a substance: because is a mixture of two or more material which are not completely comband tougher but are phsicla comband tougher</h3>
Answer:
a fossil that is useful for dating and correlating the strata in which it is found.
Explanation:
Maybe D I hope it helps you