The red sea is widening at a rate of 1.25 centimeters per year. how many years will it take to widen another 812.5 centimeters?
600
650
750
800
812

This is a simple math problem, and for that, the rule of three can be used.

Explanation:

The rule of three in this case will work like this, we have three informations on the question, and we're searching for the fourth one, so by that let's do the rule of three below:

1,25cm - 1 year

812,5cm - X

After that we multiply 1,25 with X and 1 with 812,5, the result is this:

1,25X = 812,5

X = 812,5/1,25

X = 650

So the answer to the question is 650 years to widen another 812,5 centimeters.

the answers are a and c

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.