100 ! i really need these two questions answered! and i need them answered fast, pls me.

1. the amount of energy as it flows up the food chain.

a. doubles

b. decreases

c. stays the same

d. increases

2. since little energy is left for ecosystems cannot support many of them.

a. decomposers

b. producers

c. top predators

d. primary consumers

What substance acts to prevent sudden ph changes in bodily fluids?

Which of the following is not a benefit of genetically modified foods? a.pest-resistant crops b.herbicide-resistant crops c.plants that do not require water?

The hershey and chase experiments involved the preparation of two different types of radioactively labeled phage. which of the following best explains why two preparations were required? a. the bacteriophage used in the experiments was a t2 phage. b. it was necessary that each of the two phage components, dna and protein, be identifiable upon recovery at the end of the experiment. c. each scientist had his own method for labeling phage, so each conducted the same experiment using a different isotope. d. establishing the identity of the genetic material required observation of two phage generations.