What is the predominant hypothesis why animals only appeared in the fossil record about 3 billion years after life originated?

Analysis: 1. What gas filled the balloon and where did it come from? Explain.

Which of the following statements about erosion is true? a Movement is not required for erosion to take place. b Erosion occurs as a result of drastic changes in temperature. c Erosion occurs when wind or water moves over sediment, soil, or rocks.

Which type of blood vessel usually carries oxygen-poor blood?

Which organ is NOT correctly paired with its function? A.) Ovary - produces the eggs. B.) Penis - serve as the site of somen formation. C.) Testes - produces sperm. D.

Mr. jackson, 50 years old, has had discomfort between his scrotum and anus. he also has had some fevers and dysuria. rectal examination is halted by tenderness anteriorly, but no frank mass is palpable. what is the most likely diagnosis?

A tool suspected Of Being uses At A Crime scene Should be tries Out In A Tool Mark To See If It Fits

Including fiber in your diet is beneficial to your GI tract, but consuming excess amounts of fiber can result in the loss of nutrients. This statement is an example of which of the factors to consider in planning diets? a. adequacyb.

Which of the following is not a contributing factor to the declining Atlantic cod population? Which consequence of new fishing methods had the most immediate impact on the environment?

Name three professional areas in the U. S. that use the metric system

Suppose you cut your finger only slightly in what is known as a "paper cut." You observe that the cut hurts but it doesn't bleed. How would you interpret your observation? A. Nerve endings occur in epithelium but blood vessels do not. B.