What percentage of animals on earth are vertebrates? a)5% b)25% c)50% d)95% a) is the correct answer, insects, arachnids, sponges, echinoderms, cnidarians, etc. are all invertebrates, constituting ~95-97% of all animal species. therefore, only about 3-5% of all animal species are vertebrates.

Based on their location in the atmosphere, the layers are able to have their own special characteristics. for example, most weather occurs in the troposphere. what occurs in each of the other layers? (site 1)

What are two reasons for why a species might disappear from the fossil record?

Use this new information to determine the parents’ genotypes (indicated by red arrows). then calculate the probabilities that the second male offspring will have each condition. drag one pink label to each pink target and one blue label to each blue target. then use the white labels to answer questions 1 and 2. labels can be used once, more than once, or not at all.