The ulna, radius, and humerus are the three bones of the arm. the elbow is formed where these bones meet. which is another name for the elbow? a) joint b) tendon c) cartilage d) bone marrow

The correct answer is -

A) joint.

Explanation:

Elbow is considered as a hinge joint, which is formed between the forearms and upperams. It is formed particularly between proximal ends of the radius and ulna bones located in the forearm and the humerus bone distal end, located in the upper arm.

It allows the movement of the forearm with respect to the upper arm, as well as the rotation of the wrist.

Thus, option A) is the right answer.

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.