[Solved] If investment increases by $300 and, in response, equilibrium aggregate expenditure increases by $600, then the multiplier must be A) 0.2. B) 0.5. C) 2. D) 5. Megafossils: Large fossilized remains or impressions of plants or animals visible to the naked eye, used in the study of paleontology. Paleontologist: A scientist who studies fossils to understand the history of life on Earth, including the evolution of plants and animals. Early Plants: Refers to the first primitive forms of plant life that began to emerge on Earth over 500 million years ago, playing a crucial role in the development of terrestrial ecosystems. Gemma: A small asexual reproductive structure found in some plants, such as liverworts, that can develop into a new organism.