The options are missing in the question statement. However, I managed to find from another source. These are
A.they ruled much of West Africa
B.they built large cities in the West African rain forest
C. they controlled the gold for salt exchange
D. they grew powerful through trade
Answer:
B. They built large cities in the West African rain forest.
Explanation:
"They built large cities in the West African rain forest" doesn't describe all three kingdoms of Ghana, Mali, and Songhai. Ghana, Mali, and Songhai were three of the greatest western African trading states. They controlled the trade of gold, salt, and merchandise between North Africa and sub-Saharan Africa in the 16th century. Their strong trade grew them powerful.
1) Cells duplicate their chromosomes before dividing instead of after because the daughter cells would each lose one-half of the genetic information.
The duplication of chromosomes automatically leads to the duplication of the genetic information on the chromosomes and each daughter cell receives a copy each of the genetic information.
If the information are not duplicated before dividing, it means that each daughter cell will receive half information.
2) If a cell that starts with 16 chromosomes lost half of its genes during each cell division, it will take 4 divisions for the gene to remain 1.
- First division, the genes would remain 8 from 16
- Second division, the genes would remain 4
- Third division, the genes would remain 2
- Fourth division, the gene would remain only 1.
More on cell division can be found here: brainly.com/question/24276929
Answer:
D.Convention
Explanation:
The four main mechanisms that lift the air in the atmosphere and create clouds are a) Convection; b) Convergence; c) Updraft and d) Orographic Lifting
Radiation, conduction and water vapor are not responsible for creating lift in the atmosphere.
In convection, heat energy from sun raises the temperature of surface of the earth as it passes through the atmosphere. The air near the surface become less dense and hence starts rising thereby creating a lift.
Meiosis benefits the species because it allows genetic variation so you don't look exactly like your mother or father.
