Which of the following scenarios is representative of parasitism? A. Tapeworms living in mammal's intestinal tract B. Remora fish attaching themselves to sharks C. Birds feeding on insects stirred up by grazing animals D. Birds eating scraps of food from crocodile's teeth

A- Tapeworms living in a mammal's intestinal tract.

Explanation:

Parasitism is a symbiotic relationship between species, where one organism, the parasite, lives on or in another organism, the host, causing it some harm, and is adapted structurally to this way of life.

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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