Answer;
Bones
Ligaments hold together bones.
Explanation;
Ligaments are tough bands of tissue that holds the ends of bones together at a joint.
Joint is where two or more bones meet together.
Tendons are cords of connective tissues that attach muscle to bones. Muscles and tendons attach to bones on either side of a joint and thus holding bones together tightly.
Answer:
why do you think that 100 sperm cells are released during ejaculation if only one sperm is needed to fertilize an egg?
Millions of sperm cells are produced as a result of ejaculation but during swimming to the egg only few make it to the egg while just one is being fertilized.
The reason is not far-fetched because the higher the population produced the higher the competition which led to one that survives it.
If few were produced and during the cause of swimming to the egg, they die along the line. There would not be any sperm cell to be fertilized
Explanation:
The correct answer is lipophobic signal messenger.
Lipophobic signal molecules cannot enter cells by simple diffusion through the cell membrane and because of that, these signal molecules bind to receptor proteins on the cell membrane. The response time for pathways linked to membrane receptor proteins is very rapid-within milliseconds to minutes.
