What is not a reason scientists study yeast?
a.) it as closely related to animals as it is plants.
b.) it has no nucleus so it is easy to genetically manipulate.
c.) it carries out all the basic tasks a eukaryotic cell must perform.
d.) it reproduces rapidly in the lab.

B.)

Explanation:

According to my research on studies conducted by various biologists, I can say that based on the information provided within the question one answer that is NOT a reason is that It has no nucleus so it is easy to genetically manipulate. This is technically not true as yeast has a nucleus in which all it's genetic content is contained. This, along with other aspects of yeast has allowed scientists to examine the interactions between genes and proteins, as well as various cell functions.

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c. earths continental crust is thicker than its lithosphere.

because, the lithosphere is the outermost layer of the earth/ 100 km thick and is defined by its machanical properties.the lithosphere contains oceanic and continental crust that varies in age and thickness across locations and geologic time. the lithosphere is the coolest layer of the earth in terms of temperature. the term lithosphere should not be confused with the use of "geosphere" which is used to indicate all of earth systems, including the atmosphere, hydrosphere   and biosphere. the surface of the earth can be divided into the continental crust and the oceanic crust.   the continental crust is made mostly of granite while the oceanic crust is made of basalt. the average thickness of the continental crust is 25 miles and the average thickness of the oceanic crust is 5 miles.   three types of rock, igneous, sedimentary, and metamorphic, make up the surface of the earth. that's why 3 option is preferable.