Explanation

In human genetics, the sex chromosomes are X and Y.

Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).

When a father passes on his chromosomes to his offspring, he can only contribute either an X or a Y chromosome.

If he passes on his Y chromosome, the child will be a boy (XY).

If he passes on his X chromosome, the child will be a girl (XX).

Therefore, the father can only transfer his Y chromosome to his son.

Explanation

"The branch of biology that deals with organisms living in the ocean is called marine biology."
:
The term Marine Biology is used to refer to the study of marine organisms and ecosystems.

Explanation

A sphygmomanometer measures blood pressure in the brachial artery, which is the main artery that supplies blood to the muscles in the upper arm and elbow. 

Explanation

• Humans are born with around 300 bones, but as they grow and develop.
• Some of these bones fuse together, resulting in a total of 206 bones in the adult human skeleton.
• This process of bone fusion, called ossification.

Explanation

The hardest bone in the human body is the Femur.

The femur, or thigh bone, is the human body's longest, thickest, and strongest bone.

It is designed to support the weight of the body during movement.

The clavicle, or collar bone, is the skin's softest and weakest bone.