If anybody can help it would be much appreciated this is my homework for Earth science tonight out of a book that doesn’t give you the answers please help! 1. a. What are some limitations to your direct observations of
your environment?
b. Give an example of an observation that could be made with-
out using an instrument, but that would be improved by us-
ing one.
c. Give an example of an observation that could not be made
without the use of an instrument.

How do you transfer mrna into codons ? i'm so confused : (

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

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?