Answer:
4
Explanation:
Carbon has four valence electrons, so it can achieve a full outer energy level by forming four covalent bonds. When it bonds only with hydrogen, it forms compounds called hydrocarbons. Carbon can form single, double, or triple covalent bonds with other carbon atoms.
Viruses are not considered living because they cannot survive without a host organism, and they do not exhibit the characteristics of life.
The short answer is that cells respond to the chemical environment in which they find themselves. The cells around them, the specific conditions, and feedback from the environment all create specific chemical cues that inform the cells to which genes should be expressed, and in what amounts. Chemicals include hormones, cytokines, general signaling molecules, such as cAMP, etc.
i literally hopped on google for this, lol.
i hope this helps though. :)
The answer is.d. stromatolites hope it help
The left side of the human body is home to many organs like the left kidney<span>, left </span>ovary<span>and </span>adrenal<span> gland, the </span>stomach<span>, </span>spleen<span>, </span>heart<span>, and the Sigmoid </span>colon<span>. Part of the large intestine and the </span>pancreas<span> are also located on the left side of the body, according to MedGuidance.</span>
