Simple and progressive tenses

Which piece of evidence would best support reason #1? othe history of using animals for research extends asfar back as 322 bce, when early greek physician-scientists, such as aristotle and erasistratus,performed various experiments on living animals.animal research played an essential role in thedevelopment of herceptin and tamoxifen, twomedications that have already saved the lives ofthousands of women who have been diagnosed withbreast cancer.even those who believe in testing on animals when it is hnecessary for vital medical research practice what isknown as "the 3 rs-reduction, refinement, andreplacement to reduce the number of animals usedfor testing.biologists believe that chimpanzees share at least 98.4percent of the same dna as humans and gorillas shareat least 97 percent, making primates a popular andlikely choice for the testing of products intended for humans

Kthe pleasure of all living things in baldur's presence means the happiness that the sunlight brings; the sorrow of all living things at his death means the gloom of northern countries when winter comes. reread the two sentences in paragraph 7. what is the best way to improve these sentences. if there are no problems, choose correct as is.' a) correct as is. b) the pleasure of all living things in baldur's presence means the happiness that the sunlight brings; the sorrow of all living things at his death means the gloom that the winter brings. c) the pleasure of all living things in baldur's presence meant the happiness that the sunlight brings, and the sorrow of all living things at his death meant the gloom of a northern winter. d) the pleasure of all living things in baldur's presence means the happiness that the sunlight brings. the sorrow of all living things at his death means the gloom of northern countries when winter comes.

What does a change in medium allow the audience to do?