Biology

the role of the liver is that it clears toxins from the body

Is produces bile.

The endocrine system affects cells with certain receptors .

The nervous system can affect only nearby cells

Red blood cells coagulate wounds; white blood cells defend against bacteria.

Some times both ovaries produce individual egg. Then both ovum gets fertilized and Fraternal twins happens

One egg from each ovary is fertilized

Nutrients are absorbed into the bloodstream. Starch is broken down by enzymes.

Macromolecules are broken down.

Inflammation and fever are nonspecific immune system reactions.

The endocrine system sends messages using hormones. It delivers messages from the nervous system to the excretory system. It tells the excretory system when the blood is out of balance.

an ATP molecule attaches to myosin apex answers

One gland causes calcium ions to be released; another gland causes them to be absorbed

Depends on when you consider it a child. First it's a Zygote, a fertilized egg, and then a blastocyst. Medically it's not a child until it's born. But if we start with embryo you can read all about it in the link below. Someone wrote blood starts pumping and arms starts to develop but that is weeks later.

Blood pumps through the body.

or

Rhythmic breathing movements

the organs grow larger

eyes develop

lips start to form

Vocal cords develop.

Ossification

If it is the fatter bone in the leg, then it is the tibia

it makes the body create memory cells for future infections