Because females produce eggs compared to the sperm that males produce, females choose a male with the best , or the ability to produce surviving young.

limited number of eggs; limitless sperm

best genetic quality

Explanation:

Females generally produce a limited amount of eggs. This is as a result of the structure and arrangement of female reproductive organs. On the other hand, males produce an unlimited amount of sperms. This is also a result of the reproductive organs in males. However, females must choose the males with the best genetic quality to produce surviving offspring.

less eggs

Millions of sperm

Viability

Explanation:

During fertilization,the female gametes known as the ovum produces and releases eggs that will wait for spermatozoa from the male to fertilise them.during copulation,millions of sperms are produced and release but it is only the viable sperm with higher speed that are able to get to the viable eggs.viable eggs can stay alive for 1-2 days after which they die off .those fertilize later form foetus in a complex process known as reproductive process.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

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.