Which statement explains one way that lakes form? A. Lava flows block a river. A. Lava flows block a river. B. Streams flow into shallow areas. C. Groundwater feeds into low-lying areas. D. Grassy wetlands get covered by a stream.

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water.b. they use chlorophyll and oxygen to make carbon dioxide and water.c. they use sunlight, water, and carbon dioxide to make sugars.d. they use sunlight, water, and oxygen to make chlorophyll.