What is this an example of? a child with no freckles has a mother who has freckles and is heterozygous and a father who has no freckles and is homozygous recessive.

a, homozygous dominant

b, heterozygous

c, homozygous recessive

d, heterozygous dominant

C. homozygous recessive

Explanation:

Freckles are a dominant characteristic, that is, they are expressed by people who have dominant and heterozygous homozygous alleles.

In the case of the child shown in the question above, the mother has freckles and is heterozygous, which means that she has recessive and dominant alleles (Aa) for this characteristic, while the father does not have freckles which means that he only has homozygous alleles. and recessive (aa) for this characteristic. If the child was born without freckles it means that she received a recessive allele from the mother and a recessive allele from the father (a + a), in this case, the child is homozygous recessive (aa).

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.