The primary economic activity that a large percentage of Sub-Saharan African countries are engaged in is -

A) Agriculture
B) Logging
C) Industry
D) Service

The answer is a you nerd

Climatic factors greatly influence Africa's agriculture, which is considered the continent's single most important economic activity. Agriculture employs two-thirds of the continent's working population and contributes 20 to 60 percent of every country's gross domestic product (GDP).
In most African countries, the agricultural sector, which can be unstable, employs roughly half of the working population; however, in some countries such as Burundi, Burkina Faso, and Madagascar, the proportion is much higher—around 80 percent.

Avertical or horizontal line used in graphs is called a(n) equatorhope this

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen