Can someone help

Lymphatic: bacteria invade the body but are removed with the help of cells

Endocrine: A chemical message is signaled to help the body relax and sleep

Nervous: The brain signals for the muscles to contract

Explanation:

Lymphatic system is the part in the body that uses the cells in your body to help it.

The endocrine system is about hormones and how the body needs to maintain stable and have homeostasis.

The brain is part of the nervous system and it sends signals to other parts of the body.

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hi~~

i would say that hybridization occurs frequently in nature, because there are many types of hybrids that have occurred naturally, such as the mule (male donkey + female horse)

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.