Which major processes were needed for the origin of life on Earth? A. Abundance of oxygen and the ozone layer B. Active volcanoes and very cold temperatures C. Low levels of ultraviolet radiation and specific mixture of gases D. Organic molecules produced from spontaneous synthesis or from meteorites

The pronunciation aid that determines the stress placed upon a syllable is the

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?

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.