The diagram below illustrates the law of reflection.

A horizontal line labeled Mirror has an arrow labeled Incoming Light from up and left strike it at a point, and then another arrow arises at that point and goes up and right. A dotted line divides the angle made by the 2 arrows in half. A is the angle from the mirror to Incoming Light. B is the angle from Incoming Light to the dotted line. C is the angle from the dotted line to the second arrow. D is the angle from the second arrow to the Mirror.

According to the law of reflection, which statement must be true?

The measure of angle A equals the measure of angle B.
The measure of angle B equals the measure of angle C.
The measure of angle A equals the measure of angle C.
The measure of angle B equals the measure of angle D.

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.

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

Approximately how many times does an average human heart beat in a lifetime?