| Questions | 5 |
| Topics | Domain, Endoskeleton, Momentum, Moon, Nucleus |
The broadest classification of life splits all organisms into three groups called domains. The three domains of life are bacteria, archaea and eukaryota.
An endoskeleton (internal skeleton) is a charateristic of vertebrate animals, including humans.
Momentum is a measure of how difficult it is for a moving object to stop and is calculated by multiplying the object's mass by its velocity: \(\vec{p} = m\vec{v}\). Like velocity, momentum is a vector quantity as it expresses force applied in a specific direction.
Tides are caused by the gravitational interaction of Earth and the Moon.
Cells are classified into one of two groups based on whether or not they have a nucleus. Eukaryotic cells have a nucleus, prokaryotic cells do not have a nucleus and therefore have a less complex structure than eukaryotic cells.