The hypothalamus influences the to send messages to the

The hypothalamus influences the pituitary gland to send messages to the endocrine glands.

Explanation:

Hypothalamus secretes neurohormones through neurons that reach the pituitary gland and regulate the synthesis and secretion of hormones from it.

The pituitary gland is attached to the hypothalamus gland and is controlled by the hypothalamus. The pituitary gland is called the master gland as it regulates the secretion of many endocrine glands.

So the hypothalamus regulates the secretion of the pituitary gland and pituitary gland control the secretion of endocrine glands like thyroid, gonads, adrenal cortex by secreting hormones in blood.

Many of the hormones of the hypothalamus is stored and released by the pituitary gland like ADH and oxytocin.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.