cells and body systems

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Which human body systems are directly involved in reflex actinos, such as knee jerk, blinking, and jumping when startled?

A cell that contains a cell wall and nucleus, would be found in which type of organism?

In which human body system are hormones produced?

Which factor has the LEAST effect on a person's metabolism?

Fats are important nutrients because they

Which disease is a result of abnormal cell division

As the population of small fish in a lake decreases, the population of large fish that depend on teh small fish for food will

Which body system is responsible for the elimination of liquid and gaseous wastes?