<span>A.The Sahara was a savanna
Northern Africa was a place of trees, grasslands, lakes and people. Today, it is the Sahara — a desolate area larger area than Australia.
Lake Yoa, in northeastern Chad, has remained a lake through the millennia and is still a lake today, surrounded by hot desert. Although little rain falls, Lake Yoa’s water is replenished from an underground aquifer.
By analyzing thousands of layers sediment in a core drilled from the bottom of this lake, an international team of scientists has reconstructed the region’s climate as the savanna changed to Sahara.</span>
Answer:
One type of frameshift mutation is called insertion. As the name implies, an insertion occurs when a single nitrogen base is accidentally added in the middle of a sequence. This throws off the reading frame of the DNA and the wrong amino acid is translated.
Explanation:
Mississippi River flows into the Gulf of Mexico - so that's how I know that the correct answer is c!
There is also a Rio Grande that flows into the same Gulf, but there are actually many rivers of this name, as it just means "Big River" in Spanish.
