What material was used to make shelters in the Stone Age? Mammmoth bones
Stone
Animal hide

Stone

Explanation:

These houses are more like our houses than any others in the Stone Age. They had foundations and they were built of wood and wattle and daub (a mixture of manure, clay, mud and hay stuck to sticks). They were sometimes made of stones. The roofs were made of straw.

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products