The answer is 1. Excretion is the process of removing cellular metabolic wastes in the body. All those materials not digested or absorbed are excreted and considered as waste.

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The answer is 3. Both of them are similar in that they both function to maintain homeostasis in the body. Homeostasis is the balanced state of a certain environment in relation to the outside.

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The answer is 2. The coordination of the two systems function hand in hand in order to maintain homeostasis inside the body, without each other, they wont function.

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The answer is 1. Without movement, these animals would not be able to find shelter, avoid predators and obtain food. Their ability to move also coordinates certain structures of the body like, their legs, eyes and muscles.

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The answer is 3. A ribosome combines together amino acids by attaching to a part of the mRNA and a complementary amino acid on a tRNA molecule. This functions in protein synthesis.

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The answer is 3. This reaction can bring about toxic effects on the human body. Carbon monoxide is an odorless and colorless gas which is harmful to our body. Upon inhaling this, it signals to both the circulatory and nervous systems then damage them.

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The answer is 1. The function of the entire body depends on the nervous system and the hormones produced in order to signal organs. They are co-dependent with each other to perform a certain task or procedure to maintain homeostasis.

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The answer is 1. In order for fats to be synthesized, the digestive and the circulatory systems take part in making this possible. Fats form from a series of processes that eventually leads to the main product.

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One important change in the blood that is needed in order to maintain homeostasis in our body is the conversion of unoxygenated blood to oxygenated blood as it goes through the respiratory system. This is needed by our body since our body needs oxygen in order to perform right.