Astronomy is the scientific study of celestial objects. (Such as stars, planets, comets, and galaxies)
Distance is the length of the path travelled
displacement is the shortest length of the path travelled
distance does not have direction, hence, it is a scalar quantity
displacement has direction, hence, it is a vector quantity
Eukaryotic cells have a membrane-bound nucleus, whereas prokaryotic cells do not. In eukaryotes, the nucleus is just one of numerous membrane-bound organelles. Prokaryotes, on the other hand, lack organelles that are attached to the membrane.
They have to have a higher density than water to have the ability to stay on the sea floor. Otherwise they would just float to the surface of the water
The existence of land bridges was used to dispute continental drift
