Tyra designed an experiment to demonstrate an annular solar eclipse. the steps of the experiment are listed below.
place a light bulb on a stand.
stick a pencil into a small styrofoam ball.
switch on the light bulb and darken the room.
stand facing the light bulb.
hold the pencil with styrofoam ball very close to the eye.
observe the light bulb without moving the eye and styrofoam ball.
tyra's experiment has a flaw. which of these statements best describes a method to correct the flaw in tyra's experiment?

place the light bulb behind the observer.
clamp the styrofoam ball behind the light bulb.
move eye towards the right to observe the light bulb.
hold the styrofoam ball at arm's length from the eye.

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

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?

What is the primary function of the nervous system?