Which type of protein transmits information into the cell by other molecules attaching to it

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

What is the role of the phospholipid belayer in cellular transport in living cells

The large increase in atmospheric carbon dioxide in the last 50 years most likely comes from a. an increase in cellular respiration b. increased decomposition by bacteria c. an increase in the burning of fossil fuels d. an increase in photosynthesis