*Question*
You are presented with the question "What has skeleton made of tough tissue that contains a protein called collagen?" and the following answer choices: - mammals - rocks - animals - sharks - a fish - cows - humans - plants Now knowing that cartilage is a tough tissue that contains a protein called collagen and sharks have a cartilage skeleton, choose the best answer.
**Answer**
sharks

*Question*
You are presented with the question "A long tail can be used to do what?" and the following answer choices: - courtship - Electrical energy - gather meat - hide from predators - swim through water - it keeps an organism warm - reproduce - build shelter Now knowing that along tail can be used to move through water by an animal and thus swimming is defined as a special kind of moving, namely moving in or through water, choose the best answer.
**Answer**
swim through water

*Question*
You are presented with the question "Viral envelopes are sometimes made of fats and what?" and the following answer choices: - cellulose - glucose - Energy. - protein - viral particles - Energy - food - bacteria Now knowing that some viruses have an envelope of phospholipids and proteins and phospholipids are body fats, too, choose the best answer.
**Answer**
protein

*Question*
You are presented with the question "What is the process of removing feces and excess water from the human body called?" and the following answer choices: - recycling - salivation - waste production - excretion - Exfoliation - perspiration - Deposition. - Deposition Now knowing that excretion is the process of removing wastes and excess water from the body and solid waste is called feces, choose the best answer.
**Answer**
excretion