What is a base?

a substance that can accept an OH - ion

a substance that has a low pH value

a substance that is alkaline

a substance that can donate an H + ion

What form is carbon dioxide before and after photosynthesis

The earth's worst mass extinction was: A. Late Devonian B. Ordovician-Silurian C. Permian-Triassic D. End Triassic E. Cretaceous-Tertiary

Which statement describes the formation of diamonds? a. diamonds form in talc under very low pressure. b. diamonds form in talc under ver high pressure. c. diamonds form in kimberlits under very high pressure. d.

Draw a punnett square to show the possible allelic combinations for this gene in the f1 generation (note, all parental generation flies are homozygous for selected traits).

Which layers of the Sun can only be seen during a solar eclipse? Select all that apply. A. core B. corona C. photosphere D. chromosphere

How does biotechnology can increase or decrease variation

Why is there very little methane in Earth's atmosphere compared to the amount of carbon dioxide

Which process makes it possible for the major organs of the body to be formed by week 10 of human development

How are gases distinguishable from a solid or liquid at the molecular level?

How are seeds different from spores? A. seeds have endosperm which provides nourishment for a new plant, but spores do not have any food supplies B. Spores involve egg and sperm cells, while seeds do not C.