HAL Fran was observing a leaf and a rock with a microscope. Which part of the cell theory might she be investigating?

A organisms are made up of cells
B cells come from pre-exisitng cells
C groups of cells join together to form tissues
D molecules are atoms bonded together

that all the living organisms are made of cells

showing a photograph would make this a hell of alot easier

answer: although many types of viruses can cause a common cold, rhinoviruses are the most common culprit. a cold virus enters your body through your mouth, eyes or nose. the virus can spread through droplets in the air when someone who is sick coughs, sneezes or talks. theres your answer

explanation: