Which of the following ecosystems is located in a semiarid climate region, is prone to drought, and is a transition zone between a desert area and a tropical grassland? A.
the Serengeti
B.
a mangrove
C.
the Congo rainforest
D.
the Sahel

Please select the best answer from the choices provided
A
B
C
D

Dominic and stacy each have a stamp collection. dominic has six fewer stamps than three times the number of stamps stacy has. dominic and stacy decide to give all of their stamps to their younger sister, mary. if stacy had s stamps, which expression represents the number of stamps that mary received? a. (3s − 18)(3s − 6) b. 2s − 18 c. 4s − 6 d. 4s − 18