It is called blind. a condition in which the participant is not aware if he/she is in the experimental or control group
When charged particles from the sun strike atoms in earth's atmosphere, it causes electrons to move to a higher energy state. When the electrons drop back to a low energy state they release light photons. This is what causes the Aurora lights
Answer:
Diffusion
is the movement of molecules from an area where there are many to an area where there are few
Hope it helps
Answer:
The two membranes pull apart a little and create a small pocket or sack of air. As the developing bird grows, it breathes in oxygen from the air sack and exhales carbon dioxide. Several thousand microscopic pores all over the surface of the egg allow the CO2 to escape and fresh air to get in.
Explanation:
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Answer:
Ocean water is a mixture! Salt and water together, makes salt water, since the salt dissolves in it.
Normal water in a cup, though, is a pure substance. Nothing is in it, and its purified, so it is not a mixture.
If it's more than one things, it's a mixture!
I hope this helps!
