How much of the Earth’s surface do deserts cover and where do they occur? What are the four major types of desert? (Site 1)

Which of the following always exist between two objects having mass ● elastic force ● contact force ●gravitational force ●magnetic force

Feedback is given with little or no reservation 1.supportive 2.high-monitoring 3.positive 4.low-monitoring ?

The different forms of a gene for a given trait are called .