Evolution is a a. variable because it is a factor that can be changed during experimentation. b. theory because it is an explanation that is supported by extensive observations, experimentation, and reasoning. c. law because it has been proven without exception under certain stated conditions. d. prediction because it makes an educated guess about events that will occur in the future.

Evolution is a theory because it is an explanation that is supported by extensive observations, experimentation and reasoning.

Option B

There can be many reasons that evolution is a theory.

1. A scheme or system of ideas or statements that are kept as an explanation or account of a group of facts or phenomena.

2. It is a hypothesis that is confirmed by observation or experiment and is accepted as accounting for the known facts.

3. Evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection.

There are tonnes of evidences of evolution on the planet Earth.The most common example is the evolution of man. From australopithecus afarensis to homo sapiens today.

after balancing the chemical equation, what are the coefficients for these compounds?

h2s      

⇒ 3

hno3    

⇒ 2

works for edg

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.