The answer is B. There are 3 types of muscle fibers: slow twitch, fast twitch oxidative (fast twitch), and fast twitch glycolytic (intermediate twitch). Answer A is incorrect because smooth and cardiac are actually muscle tissues, not fibers. Answer C is incorrect because involuntary is not a fiber at all. It’s a form of reflex that you can’t control which means it’s not a fiber.
Mechanical weathering breaks rocks into smaller pieces without changing their composition. Ice wedging and abrasion are two important processes of mechanical weathering. Chemical weathering breaks down rocks by forming new minerals that are stable at the Earth's surface.
<span>Homologous chromosomes exchange DNA during meiosis in a process called crossing-over. Crossing-over sometimes involves an unequal swapping of DNA. Basically one chromosome in the pair gets extra DNA.</span>
