Answer: A substance is matter which has a specific composition and specific properties. Every pure element is a substance. Every pure compound is a substance. Examples of substances: Iron is an element and hence is also a substance.
Explanation:
Answer:
Instantaneous speed is found by taking the absolute value of instantaneous velocity, and it is always positive. Average speed is the total distance traveled divided by elapsed time.
C - Angiosperms
Hope that helps! :)