Answer:
A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method
Explanation:
The definition of calories is a measure of energy in food, specifically the measure of heat needed to raise a kilogram or a gram of water by one degree Celsius.
Ultraviolet radiation is the primary cause of sunburns
I think #1 is pointing to the cell membrane
#2 is pointing to the nucleus
#3 is pointing to the chromosomes
and #4 is pointing to the cytoplasm
A micrograph is "false-colored" because scientists often use computer techniques to add color in the colorless electrons to make certain structures stand out.