During a test trial, the control and test group are both given a pill. to account for the effect patients may think the drug being tested is having just because they believe they're being treated, the control group is given a "sugar pill," which is called what?
a) placebo
b) drug
c) medicine
d) screening tool
ohp xd nvm, the answer is a !

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.

its first and third is your answer i did the qustion the fourth isnt right

explanation:

a