Pz which of the following is marked by the appearance of organisms with hard parts?
question 8 options:

the beginning of the cenozoic

the end of the precambrian

the end of the mesozoic

the beginning of the cretaceous

Which is a result of the emission from the use of fossil fuel

Which is not part of the definition of a family? two or more related people living together being married or in a partnership a single person living alone choices a and b

Which statements describe sustainable development? multiple answer choice -fishing does not remove more fish from water systems than can be replaced by the number of fish that will be born to replace them. -sustainable development is development that is designed to improve the economic conditions in less-developed countries. -sustainable development is mainly a regional issue. -sustainable development means water is used at a rate that won't reduce the amount available for future use. - sustainable development policies only need to be concerned with environmental protection. - trees cannot be cut down faster than the number that will be replaced by new growth.