The method that tells you which layer is the oldest is using relative age, with this you can analyze the rock and know that they deepest one is the oldest. This answer does not have the actual method name due to the fact i cannot remember.
The plastic carrier ring would either be caught around their neck or they would have eaten it.
Answer:
Natural selection doesn't really choose what animal/species is going to survive it's all based on the environment they live in. While a blue bird does well in the jungle it may not do well in the desert. For individuals it's based on their genes and genetics. Some are more prone to have a trail that doesn't benefit them and in fact, harms them in their environment. For populations you will see lots of the same animals but with different traits so some may do better in the wild than others because of those traits. A population is more likely to be successful because you do better when working with others. So animals have a better chance to survive if there is more diversity.
Answer:
C) Scientists who have developed computers were improving on the work of scientists before them.