How can a layer of rock containing a fossils could be present in a mountain wall that is several thousand feet above sea level

Which of the following is the best definition of an atom? O A. A positively charged particle 3. A negatively charged particle C. The basic unit of all living things O D. The basic unit of matter

What changes occur in the genes of sex cell

How can scientists produce beneficial traits in organisms

Which of the following is not a cause of soil depletion? A. conservation tillage B. erosion C. overtilling D. deforestation

Invertebrates: a) are not a monophyletic group. b) are animals without a backbone. c) have more species than vertebrates. d) All of the above. include arthropods, mollusks, and flatworms, among others.

Can energy be transferred from animal to animal

The more stomata the more water loss?

Why does it take a long time to develop a new variety of tomato? A. Changes in traits happen gradually, over many generations. B. Many plants resist change. C. Tomatoes cannot acquire new traits. D. A species cannot change over time.

Select the one true statement. Vacuoles store nutrients, water, and waste in animal cells. Plant cells can have chloroplasts but do not have a cell wall.

Using water more effectively A. Protects the environment B. Causes the loss of natural pollution filters C. Increases with contamination D. All of the above