Which human activities cause desertification in the Sahel?

Choose all correct answers.

drilling for oil

mining

overfarming

grazing large herds

Which revolution led to the development of these civilizations?

Which of these is least likely to be an adaption? a. a mouse digs a hole to hide from predators. b. a snake bites its prey to deliver it deadly venom. c. a jackrabbit has large ears that it release body heat. d. a parrot learns to say its owner's name.

Which of the following is a way that advancements in technology improve humans' ability to measure air quality and protect human health?