Instead of seeds they produce spores. My names Gary Winthorpe and you can ask me any questions you want ;)
Answer:
The complement system is a <u>biological</u> barrier of the immune system.
Explanation:The answer is biological for edgeunity
According to the definition of the periosteum,
The periosteum is a membrane that covers the outer surface of all bones, except at the joints of long bones.
D. Since the black ones are more easily camouflaged they will not be killed off as quickly as the tan ones.