1. When muscle tension develops but the load is not moved. 2. Determined by alternating motor units of a muscle organ even when the muscle is at rest. 3. Continued sustained smooth contraction due to rapid stimulation. 4. When the muscle tension developed overcomes the load and muscle shortening occurs. 5. How a smooth increase in muscle

you are the source of the heat energy. you can minimize the heat energy by selecting the appropriate clothes to wear.

answer; a male inherits only one allele of the x-linked gene controlling hair color;

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

this is a good question! i'll do some research and come back when i have the answer!