A laboratory study using rats showed a steady increase in physical effects as the concentration of a toxic substance in their food was increased. this suggests that:

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

The pressurized plants and fungi mentioned in the video have some surprising similarities. what differences would you expect them to have?

During dna replication,each strand of dna is used as a template to produce a complementary strand of dna. this process is shown below. which base will attach to location