If a scientist wants to design an experiment to measure the effect of vitamin c on colds, which of the following would be an appropriate placebo?
a. half the recommended daily amount of vitamin c
b. a sugar pill that does not contain vitamin c
c. the recommended daily amount of vitamin d
d. the recommended daily amount of vitamin c

Urgent. the table shows the relative blood flow through some organs in the human body that is, the percentage of blood that flows through a given organ, through which organ(s) does all the blood flow? explain the effect of exercise on blood flow to skeletal muscles.

Pls in your opinion, what are the limiting factors that might affect the growth or diversity of our ecosystem? respond to this question in claim, evidence, reasoning format. 1. make your claim (i are the limiting factors that might affect the growth or diversity of our 2. follow the claim with 3 pieces of evidence. evidence may be taken from the reading, the videos, previous lessons, or googled answers. site sources, too. 3. use reasoning to explain why you chose your evidence.

Examine the air pressure map. which type of line is shown on the map?