Question:
Which statement best compares single-celled and multi-celled organisms?
Answer:
Organelles in a single-celled organism are like the organs in a multi-celled organism.
Question:
The burning of fossil fuels has increased the carbon dioxide content of the atmosphere. What is a possible effect that the increased amount of carbon dioxide is likely to have on our planet?
Answer:
A warmer climate
Question:
In a comparison of metals to nonmetals, metals tend to have
Answer:
greater conductivity and higher melting points than nonmetals.
Question:
In a desert environment, cactus wrens often build their nests in cholla cacti to avoid predators. This behavior does not hurt the cacti. Which type of relationship do cactus wrens and cholla cacti demonstrate?
Answer:

commensalism