Q: The hardest natural substance, diamond is a form of what element? Choices: - zirconium - zenon - hydrogen - carbon A:
carbon

(Question)
Q: Many disciplines within the study of biology contribute to understanding how past and present life evolved over time; these disciplines together contribute to building, updating, and maintaining this? Choices: - amount of life - root of life - forests of life - tree of life A:
(Answer)
tree of life

Ques: Q: The first photosynthetic organisms were not plants, but types of what that lived in the water? Choices: - pathogens - fungi - algae - bacteria A:
Ans: bacteria

(Q).
Q: Oxygen, carbon, hydrogen and what other element make up approximately 96% of living matter? Choices: - calcium - helium - silicon - nitrogen A:
(A).
nitrogen

Ques:Q: What carry messages from our sensory organs and others to the central nervous system? Choices: - fibers - valves - blood vessels - nerves A:

Ans:nerves

Q: Overproduction of offspring, combined with limited resources, results in what? Choices: - continuation - contention - concentration - competition A:
competition