Dying this map of the continents and ridges on Earth. Why do the shapes of parts of Africa, South America, and North America appear to fit together like puzzle pieces?
A. The continents are spreading apart as Earth grows larger.
B. The continents were connected, but a meteor broke them apart.
C.
The continents have a large valley between them that has filled with ocean water.
D. The continents were connected, but expanding mid-ocean ridges have pushed them apart.

dopamine..

"it was found that some people who were taking the drug l-dopa to raise their levels of dopamine were developing schizophrenic-like symptoms supporting research a strength of the dopamine hypothesis is that there are many studies which have shown support for the neurochemical explanation."

d eras and periods

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.