A scientist testing the effects of chemical fertilizer on apple trees sprays part of an orchard (50 trees) with the fertilizer. Another part of the orchard (also 50 trees) does not receive the fertilizer. In the fall the number of apples harvested from each part of the orchard is counted. The part of the orchard with the chemical fertilizer averaged 62 apples per tree. The part of the orchard without the fertilizer averaged 45 apples per tree.

In order for this test to be valid (fair) both orchards must:

A. receive different amounts of fertilizer

B. have different species of apple trees

C. receive different amounts of water

D. have the same species of apple trees

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.

one centimetre is equal to 0.01 metres

the answer is otpion c) understanding

he wants to be heard one more time. he wants to be understood. he needs the truth one more time.

answer: although many types of viruses can cause a common cold, rhinoviruses are the most common culprit. a cold virus enters your body through your mouth, eyes or nose. the virus can spread through droplets in the air when someone who is sick coughs, sneezes or talks. theres your answer

explanation: