I believe it is either B or A, personally i'm leaning towards B, but at the same time, i don't think that we would be obtaining materials via pollination, so it then causes A to make more sense.
Answer:
light
Explanation:
The above experiment is an investigation on the factors that affect photosynthesis which include carbon dioxide concentration,light intensity and quality,chlorophyll, water and temperature.Light was the independent variable. When the lant is moved to an area where light intensity is low, the rate of photosynthesis decreases.
After the experiment, oxygen gas is produced being a by-product of photosynthesis. Plants that are not adapted to an aquatic environment are not suitable for this experiment. The amount of carbon dioxide dissolved in water is low.
Experts are rarely able to distinguish between two people handwriting. This is FALSE. Reason here is that a person can identify for two different people.
2. There are often no specific tests that can be used to definitely prove that something has been forged. This is TRUE. there is no specific prove that something has forged.
3. Documents examiners have have an easy time in obtaining exemplars because most people volunteer them. This is FALSE because there is no easy way to obtain exemplars of documents.
4. All typewriters and related devices will have variations in the type over time as the typewriter experiences wear and tear to its parts. This is TRUE because typewriters and other devices will not have variations of tear and wear to its parts.
it involves negative feedback loop
Explanation:
the loop allows living organisms to maintain homeostasis
