When scientists are doing research to determine how the environment affects a life form, it often takes many years to reach a conclusion. why do you think that is the case?
a. many environmental factors must be considered (water, light, and temperature were just three that were investigated in this simulation).
b. many tests must be performed because variables need to be tested one at a time (first test for water effects, then test for light effects,
c. some effects take a long time to become noticed, so the experiments often have to take place over long periods of time.
d. all of the above.

The correct answer is option D, that is, all of the above.

Explanation:

While performing an experiment to find the effects of the environment on a life form there is a need to consider a lot of factors as many factors in tandem can affect the species in a mentioned scenario. While testing some of the variables would not be seemed obvious at first instance, therefore, in the first look or test, the outcomes are generally inconclusive. At the same time, there is a need for each of the variables to be tested carefully, and also some of the variables may consume more time in order to sound conclusive.

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

i hope this you