12. a. why is nitrogen necessary for life? include the terms amino acids and proteins in your answer.

b. oxygen combines with nitrogen to form what types of chemicals that are used by plants?
c. why is phosphorus necessary for life?
d. phosphorus combines with oxygen to form what types of chemicals that are used by plants?
e. what does the polar nature of water molecules have to do with substances being able to dissolve in water?
f. why is the ability of substances to dissolve in water important for plants?

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)