Answer:
Either (1.) Fossils or (2) Radiometric dating.
Explanation:
Fossils are an obvious answer to this, but radiometric dating is the method most scientists use to find the age of rocks. Radioactive isotopes break down predictably, so the farther along this process is, the older the rock is.
The myelin sheath (C) insulates the axons.
The myelin sheath is a fatty substance, hence why it is great for insulation. <span />
Precipitation and temperature
Answer:
Joint legal custody
Explanation:
During separation of parents depending on the jurisdiction, custody can be granted as either physical or legal custody.
Physical custody involves or relates residential care of the child whereas legal involves participation in important decision involving the child.
In cases of Joint legal custody, both parents participate in important decisions with physical custody going to one parent.