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Atoms are small particles that make up everything.  If you picture an object made up from mini-footballs then that's what the atoms look like that make up the object just on a much, much smaller scale....

Genes are made up of DNA molecules. DNA molecules store genetic information that is carried on to the off-spring. Genes are certain specific collection of the DNA molecules that perform specific task s...

Speed is a scalar quantity i.e it is a quantitative measure and has no direction. Whereas velocity is the speed of an object in a given direction.

Examples of physiological problems and the adaptations of plants: 

1. Body support. As organisms in water face lower pressure than in air, algae did not need to have composite body part...

Osmosis is basically the movement of water across a semi-permeable barrier (i.e. a barrier that lets some molecules through but not others - like a cell membrane). Usually, the water m...