Evolution by natural selection.
survival of the fittest=natural selection
Please help me with my question
Water is polar. Lipids are non-polar.
Many scientists never wear a lab coat at all. Some work in fields that don't require lab work and do their work behind a computer. Some use their science degrees to teach or write about science. Some work as consultants for companies, or as editors for scientific journals.
The pericardial cavity separates the parietal and visceral pericardium
