<span>Nervous tissue is comprised of neurons, or nerve cells. These cells receive and transmit electrical impulses to and from the brain. Such impulses are responsible for communication between the brain and spinal cord with every cell in the human body,</span>
The answer is the 4 means that there are 4 H (hydrogen) atoms in one ammonia molecule. The 3, on the other hand, symbolizes that there are three (3) ammonia molecules. Therefore, cumulatively, there are 3 nitrogen molecules and 12 hydrogen atoms
Food chains model energy flow through an ecosystem. Producers pump energy into an ecosystem from an environmental source, and this energy is then passed from one organism to the next.
Answer:
Natural selection and selective breeding can both cause variations in animals and plants. The distinction separating the two is that natural selection occurs naturally, but selective breeding only happens when humans intervene. For this purpose, selective breeding is seldom called artificial selection.
Explanation:
