List major characteristics of animals-are heterotrophic, multicellular, use absorptive nutrition, have no cell walls, usually have nerves, muscles and the ability to move2.explain possible reasons why the cambrian period led to a rapid increase in animal diversity

Answer No 1:

The major characteristics of animals are:

Answer No 2:

There are a number of reasons why the Cambrian Period led to a rapid increase in animal diversity. Some of the reasons are:

characterization of nanoparticles is a critical step in nanomaterial production as it provides information of dimension, morphology, surface charge, distribution and degree of surface functionalization.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.