They are variables that cannot be changed or are purposefully not changed in an experiment.
Answer:
the scientist obtain that plants perform photosynthesis process in the presence of sunlight and chlorophyll.
Explanation:
they perform photosynthesis process taking water and carbon dioxide in the presence of sunlight and chlorophyll and produce glucose and liberate oxygen gas. Hence sugars are obtained from this process.
Combination birth control pills work to prevent pregnancy
mainly because the pills constrain a woman’s time of ovulation – or they stop
your ovaries from releasing ovules. Combination
birth pills are taken orally and they are composed of both steroid hormones and
estrogen which can stop ovulation.
