Which experiments led to changes to the original cell theory?
a. experiments that showed that blood cells transport gases, waste, and nutrients throughout the body.
b. experiments that showed that all cells are similar in how they metabolize and in their composition.
c. experiments that transplanted synthetic chromosomes into bacterial cells to create a new species.
d. experiments that established the existence of single-celled organisms and microbes

Which geologic feature would most likely be represented by contour lines john far apart from one another? a cliff a hill a plain a valley

Tara sees a commercial for a brand of pills that promise to boost energy and people perform better in work and school. as people in the commercial talk about how much better they feel when taking the pill, tara notices a message on the bottom of the screen that reads, "this pill is not approved by doctors and has not been tested in controlled experiments." what is the best conclusion that tara should make about the commercial? it is making scientific claims based on subjective observations. it is making scientific claims based on opinions instead of pseudoscientific facts. it is making pseudoscientific claims based on objective observations. it is making pseudoscientific claims based on opinions instead of scientific facts.

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection