I think it is D but I'm not sure, however, 4 seems pretty right.
Answer:
Organisms respond to a signal called a stimulus.
Explanation:
Answer:
electromagnetic energy
Explanation:
sunlight is a radiation, from the electromagnetic spectrum we have visible light and ultraviolet radiation whose source is the light
Answer:
4.22
Explanation:
pH scale ranges from 0-14. 0-7 being the acidic range with 0 being the most acidic, 7 -14 is the basic range with 14 being the most basic.
