Q: What works by providing a lower energy pathway from reactants to products? Choices: - thermodynamics - hormones - magnetism - catalyst A:
catalyst

(Question)
Q: Cellular respiration and photosynthesis are important parts of which cycle? Choices: - vapor cycle - greenhouse effect - water cycle - carbon cycle A:
(Answer)
carbon cycle

Ques: Q: What happens to the total energy of the system when heat is positive? Choices: - nothing - it remains constant - it decreases - it increases A:
Ans: it increases

(Q).
Q: Anabolic steroids, a form of the male sex hormone testosterone, are one of the most widely known performance-enhancing drugs. steroids are used to help build what? Choices: - bone mass - nervous tissue - brain tissue - muscle mass A:
(A).
muscle mass

Ques:Q: What is the term for the basic contractile unit of the muscle? Choices: - filament - sphincter - bandimere - sarcomere A:

Ans:sarcomere

Ques: Q: The diatoms are unicellular photosynthetic protists that encase themselves in intricately patterned, glassy cell walls composed of silicon dioxide in a matrix of organic particles. these protists are a component of freshwater and these? Choices: - waste plankton - land plankton - source plankton - marine plankton A:
Ans:
marine plankton