Gametes must carry half of their genetic material because - A) sexual reproduction only requires one parent's genetic information

B) gametes are small and can only hold half the number of chromosomes

C) the gametes' chromosomes will be copied prior to cell division

D) two gametes will unite during fertilization to create a full set of chromosomes​

B The zygote must contain genetic information from the mother and from the father, so the gametes must contain half of the chromosomes found in normal body cells

Explanation:

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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.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.