Biology, 23.10.2019 23:00 xcoder1732

Early scientists developed major principles of development via simple experiments. driesch separated the cells of a two cell se urchin embryo and each produced a whole, but smaller embryo. in contrast, when roux killed one of the two cells of a two cell frog embryo, only half an embryo developed. what does this contrast tell us about cell fates?

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Answer from: marisolishwerd2265

Cells contain pre-programmed cell fate information but can also adjust their fate based on signalling from neighbours.

Explanation:

From Driesch's experiment it can be seen that even though the two cells are separated from each other, each of these two cells had the information which enabled these two cells to produce a whole embryo as both these cells possessed the same genetic information that was required. Thus, Driesch's experiment led us to the conclusion that each cell has its pre-programmed cell fate which it follows and differentiates accordingly. However, from Roux's experiment it can be seen that in the absence of another cell the single surviving cell was not able to develop into a whole embryo which points out to the fact that even though the cells have a pre-programmed fate, for their differentiation they require signaling interactions from their neighboring cells to reach their ultimate fate.

Answer from: Quest

The answer is d. when it begins to fall back to the child's hand

Answer from: Quest

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.

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