Drag the tiles to the correct boxes to complete the pairs. Before the presence of living organisms, Earth was a very different place. Match each fact about Precambrian Earth to the sphere most affected by it.

Tiles:
- Cyanobacteria began to emerge as a life-form.
- Oceans contained far less salt than they do today.
- Oxygen spilled into this sphere from ocean waters.
- Oxidation in rocks and minerals was not possible.

spiders belong to a group of arachnids.

arachnids have the following traits :

they have two body parts.

they have eight legs unlike insects which have 6 legs.

they have no wings.

these traits distinguish them from insects.

the information that antonio is doubting us the statement that spiders differences are as a result of being first to evolve.

this is because the evolution of one species is independent of the other species.

what's the question ?