The protist, plasmodium, can invade and live in the blood of animals, causing the disease malaria. this shows which type of interaction between the protist and the animal?

Plasmodium species causes malaria in humans. It is also called as a malaria parasite. Its life cycle involves two hosts, mosquitoes and humans. Mosquitoes get malaria from biting a human who has malaria. The mosquito draws the blood into its stomach where malaria parasites breed and infect other red blood cells. Humans get malaria from a bite by an infected mosquito. This bite injects malaria-causing parasites into your blood, where they travel to liver cells. In the liver cells, the parasites breed. The interaction between Plasmodium and its host is parasitism. Plasmodium takes nutrition from the host and harm them. Therefore, Plasmodium is a parasite.    

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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