If the earth were too close to the sun, then the heat of the sun evaporates all the water and create an atmosphere that is similar to Venus. If all the oceans on the earth get evaporated and it would result in a huge amount of clouds and may block all the sunlight.
Because of the thick blanket of the cloud on the Venus, it too hard to see the surface. Early Venus must of water like the earth.
Homologous structures compare the same anatomical features in different species. C is correct because it compares the same trait (wings) in different species (dragonfly vs. bat)
