Vestigial structures have ________ in a modern organism.

Caenorhibditis elegans is widely used as a model system in research on human aging. Which of the following is not an advantage of using C. elegans as a model system? Its evolutionary distance from humans The fact that it has been sequenced Its generation time It has a fixed number of body cells. Its size

True or false: all protists have a nucleus

One trait that unites animals as a group is that they all __________. Choose all that apply.  Reproduce asexually Can be single-celled organisms as adults Have bilateral symmetry Require other living things to make biomolecules that provide their carbon and energy sources Create specialized internal organs

_______ refers to a one-celled living organism while _________ refers to a living organisms made of more than one cell.

An organism with radial symmetry is one that ______.   Question 4 options:   a)  has a lined body cavity.   b)  has one plane of symmetry and body parts that are mirror images on the left and right sides.   c)  does not have a lined body cavity.   d)  has many planes of symmetry and body parts arranged around a central disk.

A monophyletic taxon (group) contains an ancestor and all of its descendants. True False

Darwinism and Human Evolution

Mammalian species possess an amniotic, a character state also inferred to have been present in the ancestor they share with Reptilia. Thus, this shared homologous trait is a______________of Mammalia. Group of answer choices symplesiomorphy synapomorphy analogy homoplasy      PreviousNext

Which of the following is NOT a characteristic that defines life? Order O Adaptaion O Energy processing Color