A group of students is investigating whether silver is a better thermal conductor than copper. The students take a silver wire a
nd a copper wire of the same length and diameter. They put equal lengths of wax on one end of each wire and dip the other end into a beaker of hot water. The length of wax left on the wires after 10 minutes is shown. Experimental Observations Silver Copper Original length of wax 3.5 cm 3.5 cm Length of wax after 10 minutes 1.2 cm 2 cm What was a control variable in this experiment?
Coal is a fossil fuel. It comes from the remains of plants that died about 100 to 400 million years ago. Coal is a non-renewable energy source because it takes millions of years to form
The basic unit of classification of living things is species. species is the smallest unit containing members which have the largest number of features in common and usually interbreed among themselves.
Thus, the group of deer describes a specie since they can interbreed freely and are similar in characteristic features.
