First one who answers this question correctly will be marked brainliest!

why can the geologic record be analyzed by looking at different rock layers?

a) all layers have the same age.

b) the layers have different ages with the youngest layers on top.

c) the layers have different ages with the oldest layers on top.

d) the layers have different ages with the youngest layers on bottom.

answer your answers like this:

answer(pretend it's a) and then next to it one sentence of why a is correct.

The difference between amphid and plasmid

Acar company is testing seatbelts using crash test dummies. the company finds that when cars come to a sudden stop, the crash test dummies' bodies continue to move forward. the seat belt keeps the crash test dummies from hitting the back of the seat in front of them. why do the crash test dummies' bodies continue to move forward even though the car stopped? a. the friction opposing their bodies' movement keeps them in motion. b. the inertia of their bodies keeps them in motion. c. the forward acceleration of the car keeps them in motion. d. the gravity pulling on the car keeps them in motion.

Recent research by marine biologists suggests that bottlenose dolphins have names for themselves. scientists played sounds they had identified as the names of particular dolphins, putting them through a synthesizer so that they did not sound like the voices of particular dolphins. the researchers found that dolphins would respond to the names of other dolphins that they were related to or associated with, but they ignored the names of strangers. this discovery suggests a much greater degree of self-awareness in aquatic mammals than was previously suspected. if this research holds up, what does it suggest about dolphins?