(Q).
Q: An aquifer is an underground layer of rock that is saturated with what? Read this paragraph and choose the correct option from the provided answers: An aquifer is an underground layer of rock that is saturated with groundwater. One of the biggest aquifers in the world is the Ogallala aquifer in the American Midwest. Choices: - ocean water - wastewater - oil - groundwater A:
(A).
groundwater

(Q).
Q: Pure constructive interference and pure destructive interference are distinguished by whether or not identical waves are what? Read this paragraph and choose the correct option from the provided answers: Figure 27.11 The amplitudes of waves add. (a) Pure constructive interference is obtained when identical waves are in phase. (b) Pure destructive interference occurs when identical waves are exactly out of phase, or shifted by half a wavelength. Choices: - before phase - in equilibrium - after phase - in phase A:
(A).
in phase

(Q).
Q: Monoecious flowers are also known as "perfect" flowers because they contain both types of what organ? Read this paragraph and choose the correct option from the provided answers: groups of angiosperms: the monocots and the eudicots. Seed food reserves are stored outside the embryo, in the form of complex carbohydrates, lipids or proteins. The cotyledons serve as conduits to transmit the broken-down food reserves from their storage site inside the seed to the developing embryo. The seed consists of a toughened layer of integuments forming the coat, the endosperm with food reserves, and at the center, the well-protected embryo. Most flowers are monoecious or bisexual, which means that they carry both stamens and carpels; only a few species selfpollinate. Monoecious flowers are also known as "perfect" flowers because they contain both types of sex organs (Figure 26.14). Both anatomical and environmental barriers promote cross-pollination mediated by a physical agent (wind or water), or an animal, such as an insect or bird. Cross-pollination increases genetic diversity in a species. Choices: - vascular organ - respiratory organ - phloem - sex organ A:
(A).
sex organ