The correct answer is - A. Devonian.
The Devonian is one of the seven periods of the Paleozoic Era. It lasted for 50 million years, from 410 million years ago until 360 million years ago. It is the period in which the first insects evolved, the first seeded plants, as well as the first land vertebrates. This period came after the Silurian period, and was followed by the Mississippian period.
Answer:
How long does it have to be ?
Answer:
In the top left
Explanation:
On a map, the top has numbers or letters. Same goes for the left side. Since "A" and "1" are the first in the alphabet and while counting, it comes first. As you go out, the letter and number will change.
Example: A1, A2, B1, B2
Red dwarf stars have a surface temperature of less than 3,500 Kelvin, and this is why they appear red to our eyes. Our own Sun is classified as a yellow dwarf star. It has a surface temperature of about 5,800 Kelvin. Because of this temperature, the bulk of the light we see streaming from the Sun is yellow/white
Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense.
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