The evolutionary development of the species H. sapiens a. is determined solely by environmental factors b. is a Mendelian trait c. is the result of both genetic and environmental factors d. is determined solely by genetic factors e. can be accurately measured by IQ tests

The correct answer is letter "C": is the result of both genetic and environmental factors.

Explanation:

There have been several studies about human evolution as a species. It is inevitable to relate this topic to the prominent findings of Charles Darwin (1809-1882) in his book "On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life" or simply known as the Origin of species. Mainly, Darwin sustained that, in general, species' evolution happens thanks to environmental adaptations that are transmitted from one generation of a species to another in their genetics.

bd = 9 cm

step-by-step explanation:

in a 30°-60°-90° triangle, the ratio of side lengths is 1 : √3 : 2. that is, the longest side (hypotenuse) is twice the length of the shortest side.

all of the triangles in your geometry are 30°-60°-90° triangles. ac is the hypotenuse of δacd, and the short side of δabc.

the short side ad of δacd will be half the length of ac, so 3 cm. the hypotenuse ab of δabc will be twice the length of ac, so 12 cm. segment bd is the difference of the lengths ab and ad, so is

bd = ab -ad

bd = 12 cm - 3 cm = 9 cm

comment on side length ratios

you can figure the ratios of side lengths in a 30°-60°-90° triangle by considering the trig ratios of the angles. or you can figure the length of the altitude of an equilateral triangle of side length 2 using the pythagorean theorem.

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