What is ciculatory system

Nitrogen is a nutrient that organisms need to produce (12). Plants and animals cannot use the nitrogen that makes up a large percentage of the (13). The nitrogen is captured and converted into a form that is usable by plants in a process called (14).

Over the course of meiosis, how many times does one cell divide into two? (careful! think it through ...)

Of the following steps in a scientific investigation, the last to be done is usually: A. experimenting B. observing C. producing a model D. hypothesizing

Which best describes the sympathetic nervous system? the brain and spinal cord rest and digest fight or flight the sensory and motor neurons

Organelles in prokaryotic cells include the

Fungal cell walls contain the carbohydrate

George, who is 60, couldn't understand why he was slowly gaining weight. He was eating the same amount of food that he had each day since he was 20 and he exercised regularly. What could explain his weight gain? A) His metabolism had slowed down.

Relate tissues to organs and organ systems. Give an example.

Which of the following is an example of a Global Environmental choice? A students deciding to ride bicycles to their school B Nations meeting to discuss the ozone layer C a Town Council considering a new nature Refuge D a family deciding to recycle

What is the wavelenght of a 1-kilohertz (kHz) sound traveling in water