Q: What were the first animals to have true lungs and limbs for life on land? Choices: - birds - mammals - reptiles - amphibians A:
amphibians

Q: What is the term for the process in which living things with beneficial traits produce more offspring than others do? Choices: - natural process - natural survival - natural variety - natural selection A:
natural selection

Q: Q: For a star to form, what force pulls gas and dust into the center of the nebula? Choices: - weight - centrifugal force - motion - gravity A:
A: gravity

Question: Q: Materials that can be magnetized are called? Choices: - atoms materials - iron materials - inclusions materials - ferromagnetic materials A:
Answer: ferromagnetic materials

*Question*
Q: What take the shape of their container, and are relatively easy to compress? Choices: - molecules - semi-fluids - fluids - gases A:
**Answer**
gases

(Q).
Q: What is required for communication? Choices: - transmission and weight of signals - weight and reception of signals - lack and reception of signals - transmission and reception of signals A:
(A).
transmission and reception of signals