In most countries with a republican government, the people elect the head of the… This trend is known as global warming The collection of bones in an animal’s body is called a skeletal system, or skeleton
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Mammals, birds, reptiles, amphibians, and fish have skeletal systems
Evolution is the theory that all the kinds of living things that exist today developed from earlier types
The differences between them resulted from changes that happened… Geometry is a kind of mathematics that deals with shapes and figures Geometry explains how to build or draw shapes, measure them, and compare them The seasons are related to the way sunlight falls on different parts of earth in the course of a year
As earth revolves around the sun, the north pole points to the same direction in space For about six months of every year the north pole is tilted toward the sun During this time the northern hemisphere gets more direct sunlight than the southern hemisphere When we say that something is in motion, we usually mean that it is moving
But motion has a special meaning in science
In science, motion is a change in position compared… The average surface temperature on earth is slowly increasing
