Answer:
D. Diseases are caused by the presence and action of specific microorganisms.
Explanation:
Answer:
Nitrogen about 77 percent of the atmosphere is composed of nitrogen
Answer:
c.All are halogens, so they are not very chemically active,
Answer:
????
Explanation:
None of those seem to be correct to me.
1. Observations are made using the five senses- sight, sound, touch, taste, and smell. So this is invalid.
2. Observations and experiments can both be done anywhere
3. See answer to 2
4. It's cut off? But observations can literally be as simple as looking at a stick and noting that it's brown, so from what I can read, it's invalid.
