Natural selection is the process by which some organisms are better adapted than others and survive and reproduce more successfully
B. Brain and spinal cord
The nervous system is an organ system in charge of sending messages to and from the brain<span> and </span>spinal cord<span> to and from all parts of the body. </span>
3. positive and a negative ion
Answer: Bones cells secrete an extracellular matrix that when combined with minerals becomes rock hard.
Explanation:
Answer:
Explanation:
It's a normal part of nature, and one of many ecological factors that help keep the hundreds of thousands of living plants. It also keeps animals in balance with one another.
