Mariam has just recently gotten pregnant. before she even found out, her embryo had already formed three germ layers. what is the layer that will develop into the nervous system?

Ectoderm

Explanation:

In addition to other structures, ectoderm gives rise to all the nervous tissues. Induction by notochord makes the ectodermal cells to form the neural plate. The elevated ends of the neural plate form the neural folds by the end of the third week of pregnancy. The fusion of neural folds gives rise to the neural tube. Brain and spinal cord develop from the neural tube. Some of the ectodermal cells transform into neural crest cells which in turn give rise to sensory neurons and the postganglionic neurons of the peripheral nerves.

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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.