What important event in animal evolution marks the beginning of the Cambrian period?

the ability to swim

the ability to fly

the appearance of hard parts

the appearance of fossils

If you see two people walking and holding hands, you perceive that they are a couple because of the Gestalt principle of

What would happen to an animal such as a shark if it's heart failed?

In terms of bonding and attractions explain how the final temperature of dissolving a solid water could be greater than the initial temperature of the water. What type of process does this represent?

Which of the following means a hormone that aids in growth of gonads? Glycogenesis Thyrotoxic Pancreatitis Gonadotropin

What is the policy used most by the Fed to change the money supply? a. changes in the money creation policy b. changes in the discount rate c. changes in the reserve requirements d. open market operations

The rising of regions of Earths crust to higher elevations is called ...

Explain what happens to energy as it moves through the energy pyramid.

What symptom of schizophrenia is illustrated by the following example? So bees with knees have fleas and fleas jump, I jump like a jack, Jack the Giant Killer.

During meiosis, sister chromatids are separated and move toward opposite ends of the cell as the centromeres that hold them separate. Which of the following processes will begin next? - Prophase I - Metaphase II - Anaphase I - Telophase II

While caring for a patient undergoing suctioning, the nurse guides the catheter along the naris floor to avoid the turbinates. which outcome observed by the nurse supports the intervention?