- 7. There are many different breeds of horses. Each breed was developed because of specific traits
needed or desired by the breeder. One type of horse is a very large, heavy animal called a
Clydesdale.
What kind of work would such a large, heavy animal be expected to do?
A. be easy for small children to ride
B. pull or carry a very heavy load
C. run a long distance without tiring
D. run very fast in races

Over the past 60 years, many amphibian species have experienced significant population declines and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. chytridiomycosis is a fungal disease first identified in 1998 as a cause of massive amphibian deaths. in some severely impacted populations, a few individuals have survived, perhaps because of some natural resistance. if these resistant individuals continue to survive and prosper, new resistant populations might emerge. this would be an example of the founder effect artificial selection genetic drift natural selection sexual selection

2. which is the last step in the scientific method?

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above