Sal drew a diagram to compare vertebrates and invertebrates.
((picture at the bottom))
choices:

are eukaryotic
have an outer skeleton
are heterotrophs
have a backbone

D, Have A Backbone

Explanation:

Animals that have a backbone are called vertebrates. The backbone is is a column of bones that supports the body, and also protects the spinal cord. The back is made up of many separate bones, called vertebrae. The backbone is part of a vertebrate's supportive internal skeleton.

the answer is false because not all countries have geysers under their crust. for example, iceland uses geothermal energy because it is available every in their country.  

the solar system used to have much dust particles option no d