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What are atoms?

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. Atoms ...
RW
Answered by Ruth W. • Science tutor
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What is the difference between genes and DNA?

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 such as...
SH
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What is the difference between speed and velocity?

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.
SA
Answered by Saanya A. • Science tutor
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First organisms on Earth were fully aquatic. About 460 mya a lineage of algae moved onto land and gradually adapted to air and soil. Name two evolutionary problems that first land plants faced when transitioning from water to land?

Examples of physiological problems and the adaptations of plants: Body support. As organisms in water face lower pressure than in air, algae did not need to have composite body parts. When moved onto land, p...
IL
Answered by Ivana L. • Science tutor
4907 Views

What is osmosis and how does it work?

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 muct move down something...
ES
Answered by Emma S. • Science tutor
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