Why is the fossil record not complete?
Rocks and the fossils they contained have eroded and disappeared.
Most organisms decomposed after death.
Many species lacked hard structures.
Many organisms were eaten by scavengers after death.

Match the functions to the cell types ? contraction and relaxation. conducting electrochemical signals fighting diseases carrying genetic material

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

Drag the tiles to the correct boxes to complete the pairs. match each cell organelle with its description.