Which of the following is just fossilized calcareous algae?

a. a coprolite

b. an ostracod

c. an ammonite

d. a stromatolite

Can you explain why ground water and surface water are alike?

True Or False: All of an organism's cells has the exact same DNA Explain how you know this is true:

3. The ocean floor is not flat. What two features are on the bottom of the ocean floor?

What is one safety guideline that Peter should follow?

What can you predict about sand dunes over time?

Which organism is able to cause an infection? (A) bacteria (B) skin cell (C) white blood cell (D) red blood cell

Which is true about enzymes? Question 20 options: They act on nonspecific, randomly chosen substrates. After a reaction, they cannot be reused. They can speed up metabolic processes in the body. They cannot change shape.

Why does the meiosis produce cells with only half the amount of DNA? How does this aid in the formation of a healthy zygote?

Which way does the sun's gravity act on any body in orbit? A. pulls it forward in its orbit B. pulls it backward in its orbit C. pulls it toward the sun

Which two processes result in variations in sexually reproducing species? (1) mutation and genetic recombination (2) mitosis and natural selection (3) extinction and gene replacement (4) selective breeding and cloning