The eastern coast of South America and the western coast of Africa are separated by the Atlantic Ocean. If scientists find the same types of plant fossils on the eastern coast of South America and the western coast of Africa, which of these would be the best conclusion?
A.
The oceans were formed after dinosaurs went extinct.
B.
The climate in each continent has changed.
C.
Dinosaurs once lived in both of these regions.
D.
At one time, the two continents were one landmass.

At one time the two continents were one landmass

Explanation:

If scientists find the same types of plant fossils on the eastern coast of South America and the western coast of Africa, this suggests that at one time, the two continents were one landmass. When the continents separated, the communities of plants were split, resulting in identical fossils on each coast millions of years later.

electron microscopy and scanning tunneling microscopes gives us a greater understanding of atoms by being able to see the atom itself, and lets us see some atomic reactions.

explanation:

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.