_Nitrogen is a crucial element for plant processes. This element cycles through the atmosphere, the soil, and a multitude of living things via the nitrogen cycle. According to the law of conservation of mass, ____.

Study the chemical reactions below.

Photosynthesis:



6CO2+6H2O+ Energy →C6H12O6+6O2

carbon dioxide and water and light energy → glucose and oxygen

Cellular respiration:

C6H12O6+6O2→6CO2+6H2O+ Energy

glucose and oxygen→carbon dioxide and water and energy



Plants produce more oxygen during photosynthesis than they use in cellular respiration. What happens to the excess oxygen produced during photosynthesis?

Study the diagram below which illustrates the cyclic nature of the formation and breakdown of the molecule adenosine triphosphate (ATP). What happens when the chemical bond which attaches the third phosphate group to the molecule is broken?





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Benji hears a loud noise and turns his head to locate the source of the sound. The response impulse was carried away from the brain and spinal cord to Benji's neck muscles by ____.

_When you touch something hot, you jerk your hand away from the hot object. When a stimulus causes an unconscious, automatic reaction like this, the response is called a ____.