Aristotle, who lived from 384 BC to 322 BC, taught that
the heart contained the intelligence. Except for a few
guesses like this, he observed carefully. He described
the habits and the bodily structure (anatomy) of many
animals, birds and fish. Another Greek, Galen, who
lived in the second century AD, performed biological
experiments. Both careful observation of living things
and experiments are used today in the study of
biology. Galen observed and described the internal
anatomy of the human body.-He described many parts
that he saw in the body. But he was not always careful.
He sometimes described what he expected to see and
did not look carefully to see what was really there. For
centuries after Galen, people studied anatomy from his
books instead of trusting their own observations.
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Feb 17, 18 05:06 AM
Printable and online grammar exercises-- How Much vs How Many worksheets with answers
Feb 17, 18 04:29 AM
Unless means except if. We use unless to make an exception to something we say. See details with examples and exercises.
Feb 16, 18 07:50 AM
Second conditional (type two) grammar exercise with answers -- Check your answers at the bottom of the worksheet.
Feb 14, 18 09:57 AM
If conditional type 1 (first conditional) grammar exercise with answers-- Check your answers at the bottom of the worksheet.
Feb 14, 18 03:36 AM
Uses of In Case, detailed rules explanations with examples and exercises for English learners and teachers
Feb 14, 18 03:32 AM
Uses of Wish Clauses, grammar rules with examples, exercises, and detailed explanations.
Feb 14, 18 03:26 AM
IF clauses / First, Second and Third Conditionals (Type 1, type 2, type 3) categories explained with details, examples and exercises
Feb 14, 18 03:22 AM
Third conditional if is used for unreal situations in the past. Type three conditional grammar, with examples and exercises
Feb 14, 18 03:21 AM
Second conditional IF also referred as Type 2 conditional is used for...See second conditional rules, examples and exercises
Feb 14, 18 03:19 AM
First conditional if (Type one conditional) is when the condition is in present or future... see details with examples and exercises