Evaluate the age of rocks. you find three undisturbed rock layers. The middle layer is 120 million years old. What can you say about the layers above and below it

A protein is 300 amino acids long. Which of the following could be the number of nucleotides in the section of DNA that codes for this protein? (Remember: DNA is double-stranded.) A) 3 B) 100 C) 300 D) 500 E) 1800

Which process produces the most variation within a species?

Which is a renewable resource? A) Oil B) Wood C) Iron D) Coal

What are chemicals that have certain hallucinogenic effects on human nervous systems

What is a simple statement that predicts the result of a controlled scientific experiment? Conclusion Theory Observation Hypothesis

Body composition is affected by two factors - the number of calories eaten (energy in and the amount of activity performed and calories burned (energy out. body composition is maintained by:

Which body system rapidly communicates information using electrical signals? A. Endocrine B. integumentary C. Nervous D. Respiratory

Microorganisms that cause disease are classified as

Procaryotes are distinguished from eukaryotes on the basis of what structure? (More than one answer is correct) a. a membrane-bound nucleus b. plasmid DNA c. RNA molecules d. presence of mitochondria or chloroplasts

Many higher organisms must maintain a strict internal temperature. There can be serious consequences if the internal temperature deviates even slightly.