Answer:
C. All projection maps are subject to varying types of distortion.
Explanation:
The only truly accurate representation of Earth is the globe, as earth is a sphere. When one tries to map out a 3-d sphere on a piece of paper, it is impossible without some kind of distortion occurring. This distortion happens with distance, size, and sometimes other factors. Different projections are used for different purposes because some are more accurate than others in terms of distance, size, relative position, etc.
Birds and mammals independently evolved four-chamber hearts
I think it's D. It shields life forms on the surface from radiation?
Lions and tigers competing for an antelope.
Lunar maria (plural form of the Latin word mare, which means sea) are dark surfaces that can be found all over the moon (17% of the Moon is covered in them) that have been created as a result of volcanic eruptions. These areas are made up of basalt, and given that they seemed almost waterlike, the astronomers in the distant past mistook them for seas, whence their name comes.
When it comes to craters, their origin is quite similar - volcanic eruptions created them. When lava starts erupting from a volcano, it has to get out from somewhere - and thus craters are created. If you are referring to lunar craters, however, there are many speculations as to how they were created: due to volcanic eruptions, meteoric impact, or glacier activity.
