For many years scientists believed that almost all animal lineages burst into being during the Cambrian era (just after the end of the Precambrian super eon).  However, there have been many recent findings of animal-like fossils and “trace fossils” (fossils of an animal-like organisms movement) from the late Precambrian.  Which of the following best explains why it took so long to realize there was animal-like life in the Precambrian?

Which are evolutionarily more closely related?

What are four of your favorite things you learned in this class?

Which of the following characteristics is true of all protists?

According to the endosymbiotic theory, why was it evolutionarily adaptive for the larger, eukaryotic host cell to keep the engulfed bacterium that became the mitochondrion, rather than digesting it as food?

You are the lucky student of a wacky professor who develops a time machine and he asks if you will test it with him. You get in and there’s an immediate glitch. The read out indicates that  you have traveled back 80 million years ago, and are now stuck in the Mesozoic era.  Which of the following would you most likely see when you step out of your time machine?

Polydactylism is a dominant trait that results in extra fingers and toes in humans. A normal number of digits (10 per hand and foot) is a recessive trait. A polydactyl man marries a woman with 10 fingers and toes. They have a child that has a normal number of digits. What are the genotypes of the married couple?

A control group has all of the conditions identical to the experimental group except that it _______.

_______ is a process of nuclear division in which the number of chromosomes is halved during gamete formation.

What is the advantage of the the origin of the nucleus according to the leading hypothesis?