Which identifies that a chemical has occurred?

a. new substance are produced

b. the color has changed

c. bubbles have formed

d. temperature has changed

How have the greenhouse gasses increased from the year 2000 to 2018

What state of matter is ice a. liquid b. element c. solid d. gas

How does blood clotting prevent the entry of pathogens through cuts and wounds? answer asap,, this is due tomorrow. will mark as brainliest or whatever you call it : )