D.foreleg
The saphenous veins -- there are two, the great and the small saphenous veins - serve as the principal veins running superficially (near the surface) up the leg.
The great saphenous vein (also called the large saphenous vein) goes from the foot all the way up to the saphenous opening, an oval aperture in the broad fascia of the thigh, a fibrous membrane through which the vein passes.
The small saphenous vein runs behind the outer malleolus (the protuberance on the outside of the ankle joint), comes up the back of the leg and joins the popliteal vein in the space behind the knee (the popliteal space).
The Earth and Moon compare in terms of gravitational force as Earth's gravitational force is stronger than the Moon's.
Option A
<u>Explanation:</u>
According to universal law of gravity, the gravitational force is the attractive force between two objects separated by a distance. The magnitude of gravitational force is directly proportional to the product of masses of the objects and inversely proportional to the square of the distances between them.
In this case, the gravitational force acting on us due to Earth will be considered due to the mass of Earth as the mass of Earth is very large compared to our mass.

So as the mass of the Earth is greater than the mass of the moon, so the gravitational force of Earth will be stronger than that of Moon.
Answer:
The correct answer is - d. Hormones interact with any cells in contact with the bloodstream.
Explanation:
Hormones are nothing but chemical substances that affect the activity of the target site or cells that are specific to the cells. Target sites are present in various parts of the body.
Hormones act as messengers that perform controlling and coordinating activities throughout the body. Hormones interact with their specific receptors present on the surface or in the target site.
The cell will use Endocytosis