Mechanical digestion takes place in the mouth
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A drug is any chemical substance that alters the body physically or mentally for a non - nutritional purpose.
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Pectinate muscles are parallel ridges in the walls of the atria of the heart. The name is due to their resemblance to the teeth of a comb (pecten). The heart is the organ pumps blood to all parts of the body. It is made up of four chambers, that is, right and left ventricles, left and right atria, and the blood vessels, Pulmonary artery, pulmonary vein, aorta, and venacava. An auricles are pouch like structure that increase the total filling capacity of the atrium and also increase the volume of blood that an atrium is able to contain.
Answer:
The correct answer will be:
1. Mutualism
2. Competition
3. Commensalism
Explanation:
In an ecosystem the organism interacts with each other in one of the following ways:
1. <u>Competition</u>- interaction occurs when two or more than two species depend on the same resources, sharing the same habitat and niche. These species will fight for the resources and both will be negatively affected.
2. <u>Commensalism-</u> interaction takes place when one organism is benefited while the other is neither harmed nor gained. For example- the interaction between Remora fish and large fish in the ocean.
3. <u>Mutualism</u> -occurs when the species are dependent on each other for the resources and both benefits each other. For example- the plants and birds co-evolved benefiting each other like animals helps in pollination and plants provide nectar to them.
Thus, the selected options are the correct answer.
