Q: In the water molecule, two of the electron pairs are lone pairs rather than what? Read this paragraph and choose the correct option from the provided answers: The water molecule, like the ammonia and methane molecules, has a tetrahedral domain geometry. In the water molecule, two of the electron pairs are lone pairs rather than bonding pairs. The molecular geometry of the water molecule is referred to as bent . The H-O-H bond angle is 104.5, which is smaller than the bond angle in NH 3 . Choices: - bonding ions - acid pairs - ions pairs - bonding pairs A:
bonding pairs
------
Q: Twin studies have been instrumental in demonstrating what type of component in autism? Read this paragraph and choose the correct option from the provided answers: Autism has a wide phenotypic spectrum of disability. Twin studies have been instrumental in demonstrating an environmental component in autism. Choices: - internal - bacterial - natural - environmental A:
environmental
------
Q: Heavily vegetated lands are less likely to experience what? Read this paragraph and choose the correct option from the provided answers: Heavily vegetated lands are less likely to experience flooding. Plants slow down water as it runs over the land, giving it time to enter the ground. If the ground is too wet to absorb more water, plants still slow the water's passage. Slower water keeps all the water from entering the stream at once. Wetlands play a key role in minimizing the impacts of floods. Wetlands act as a buffer between land and high water levels. Flooding is often more severe in areas that have been recently logged. Choices: - expansion - drought - rains - flooding A:
flooding
------
Q: The mars rover collected round clumps of crystals that, on earth, usually form in what? Read this paragraph and choose the correct option from the provided answers: The ice ages were very recent as Earth history goes. The animals are familiar, but they're still very different from modern ones. For one thing, most of them were huge. A small surface area-to-volume ratio is better for keeping warm (less surface to lose heat from). Although the dominant animals were mammals, the Pleistocene Earth still does not look quite modern. Choices: - rocks - volcanoes - air - water A:
water
------