laws and theories in science. which of the following is a law of science? A)a living thing is made of at least one cell B)an atom is made of at least one cell. C)gravity will pull two more objects towards each other. D)natural selection will change species to fit their environment

Can someone me with this and tell me what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

(select all the correct choose each statement that is scientific. - the opinions of randomly selected participants in a survey prove the idea that global temperatures are not increasing on earth. - the universe's average temperature and rate of expansion support the idea that it began as one super-dense and hot mass 13.8 billion years ago. - ocean tides are caused by the uneven gravitational pulls of the moon and sun on different parts of earth. - human life is more valuable than other forms of life on earth because humans are more intelligent than other organisms.

What factors contribute to the effect an environmental toxin has on the human body?