According to the rna world hypothesis, which of these tasks was accomplished by early rna, but is not generally accomplished by the rna of today's organisms?

a. carrying genetic information
b. carrying information for making proteins
c. replicating, or making copies of itself
d. acting like a battery to store and release energy

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?

Interactions between organisms and their environment impact the organism’s overall population. the jaguar panthera onca is the largest cat in north america. it is found in areas across the southwest, including arizona, new mexico, and texas. it is a carnivore that has powerful jaws and sharp teeth and preys on fish, turtles, tapirs, and many smaller mammals. which shows the relationship between the jaguar and turtles?

24. how are vaccines used to keep people healthy?