Exocrine secretions are discharged onto some external or internal body surface through a(n) .

The correct answer is "duct".

Explanation:

The structures at which substances are secreted in the body are known as ducts. For instance, the liver and the pancreas act as exocrine glands liberating bile and pancreatic juice, respectively. These exocrine glands secrete the substances from the gastrointestinal tract through a series of ducts. The ducts could be branched or unbranched, depending on the location at which the exocrine secretion takes place.

b exhibiting favoritism toward the kikuyu people.

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers