(Q).
Q: When lava flows over a large area and cools, it creates a large, flat surface of what type of rock? Choices: - tidal - sedimentary - metamorphic - igneous A:
(A).
igneous

(Q).
Q: What is usually necessary to develop cancer? Choices: - crucial genes mutations - massive genes mutations - novel genes mutations - multiple genes mutations A:
(A).
multiple genes mutations

(Q).
Q: The first line of defense includes mechanical, chemical, and which other barrier? Choices: - independent - physical - surgical - biological A:
(A).
biological