What are the two sides of dna made of? a) sugar and phosphate
b) sugar and hydrogen bonds
c) sugar and bases

its made up of alternating sugar and phosphate molecules. or the first option

Explanation:

The sugar is deoxyribose. The rungs of the ladder are pairs of 4 types of nitrogen bases.

Hope this helps =w=

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

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.