Glucose, a carbohydrate, readily dissolves in your bloodstream. Cholesterol and triglycerides—both lipids—are packaged inside the waterproof spaces of lipoproteins so they can enter the bloodstream. Use the molecular models from the activity along with those in your textbook to compare the chemical compositions and structures of glucose, cholesterol, and triglycerides. Construct an explanation for how the compositions and structures of these carbon-based molecules are related to the way they interact with your bloodstream.

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.

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

the answer is false?

a physical change is being made.