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A tick is a small biting ______.
Platinum is chemically inert and so is useful in __________ apparatus.
Drink a lot of ______ when it is hot.
The blue whale is the larges ______.
The population is the whole group from which a ______ is taken.
He made a __________ discovery about the planet Jupiter.
The food contained an essential ________.
How an ________ has evolved to survive in its environment.
The size of hole needed depends on the ____________ of the soil.
________ exercise is good for your health.
His __________ was correct.
The earth's atmosphere is one-fifth ______.
A ________ is a tiny fragment such as a speck of dust.
________ is a person or an animal that hunts a smaller weaker person or animal.
_________ action - the force of the river against the banks can cause air to be trapped in cracks and crevices. The ________ weakens the banks and gradually wears it away.
Single celled microorganisms that can _________ rapidly.
Living things break down food to release energy in a process called ___________.
A buffer is a ________ that resists changes in pH.
The ___________ in the desert was over 40 degrees.
He dressed as a ________ for Halloween.