Questions: Organisms are able to protect themselves from toxicants through which of the following? Circulatory system Skin, scales, and feathers

The answer is the fourth one: Skin, scales, and feathers.

Explanation for each option:

1. Drinking: This is not a mechanism for protecting against toxicants. In fact, drinking contaminated water can introduce toxicants into the body.

2. Breathing: Similar to drinking, breathing can introduce toxicants into the body, especially if the air is polluted. It is not a protective mechanism.

3. Circulatory system: The circulatory system distributes blood and nutrients throughout the body but does not inherently protect against toxicants. It can, however, transport toxicants to various organs.

4. Skin, scales, and feathers: These are physical barriers that protect organisms from environmental toxicants. The skin acts as a barrier to prevent the entry of harmful substances. Scales and feathers provide additional layers of protection for certain animals.

Summary: Organisms protect themselves from toxicants primarily through physical barriers such as skin, scales, and feathers. These structures serve as the first line of defense against harmful substances in the environment.