Evolution and the premortal spirit of man, conclusion: The body is the clothing of and looks like the spirit.
Man is a dual being, a spirit clothed in a mortal body. The spirits of all men belong to the family of God. The physical body is only the clothing of the spirit: Gospel Principles: "Spirit beings have the same bodily form as mortals except that the spirit body is in perfect form (see Ether 3:16).... All spirits are in adult form. They were adults before their mortal existence, and they are in adult form after death, even if they die as infants or children." (2011, Chapter 41, p.242.)
LDS.org Topic: "Spirit. The Lord [has] revealed that ‘the spirit of man [is] in the likeness of his person, as also the spirit of the beast, and every other creature which God has created’ (D&C 77:2; see also Ether 3:7-16)."
Bible Dictionary: "Spirit. Every person is literally a son or a daughter of God, having been born as a spirit to Heavenly Parents previous to being born to mortal parents on the earth (cf. Heb. 12:9). Thus each one of us is a dual being: an immortal spirit body, clothed with a body of flesh and bone."
Guide to the Scriptures: "Spirit. The spirit body looks like the physical body (1 Ne. 11:11; Ether 3:15–16; D&C 77:2; D&C 129)."
1909 First Presidency statement: "The body, which is only the clothing of the spirit, [is] its complement—the two together constituting the soul. The spirit of man is in the form of man, and the spirits of all creatures are in the likeness of their bodies. This was plainly taught by the Prophet Joseph Smith (see D&C 77:2)....
"He [the Savior] came into the world as He had promised to come (see 3 Ne. 1:13), taking an infant tabernacle and developing it gradually to the fulness of His spirit stature....
"Man, as a spirit, was ... reared to maturity in the eternal mansions of the Father, prior to coming upon the earth." (Ensign, Feb. 2002.) After the spirits of the entire human family had been reared to maturity, Heavenly Father convened a family council and presented a plan. His children would have the opportunity to become perfected and receive a fulness of joy.
Guide to the Scriptures: "Council in Heaven. The occasion in premortal life when the Father presented his plan to his spirit children who would come to this earth."
Jeffrey R. Holland: "The need for this Fall and for an atonement to compensate for it was explained in a premortal Council in Heaven at which the spirits of the entire human family attended and over which God the Father presided." (Ensign, Mar. 2008.) That the spirit body looks like the physical body was illustrated by Kent F. Richards in the April 2011 general conference:
“Thirteen-year-old Sherrie underwent a 14-hour operation for a tumor on her spinal cord. As she regained consciousness in the intensive care unit, she said: ‘Daddy, Aunt Cheryl is here,... and ... Grandpa Norman ... and Grandma Brown ... are here. And Daddy, who is that standing beside you? ... He looks like you, only taller. ... He says he’s your brother, Jimmy.’ Her uncle Jimmy had died at age 13 of cystic fibrosis.
“‘For nearly an hour, Sherrie ... described her visitors, all deceased family members. Exhausted, she then fell asleep.’
“Later she told her father, ‘Daddy, all of the children here in the intensive care unit have angels helping them.’” (Ensign, May 2011.) In the above account, Sherrie's relatives were all spirit children of Heavenly Parents and had all been reared to maturity long before the foundations of the earth were laid. Sherrie was able to recognize her departed relatives because the spirit body looks like the physical body.
Conclusion
As with all of our Father's children, Sherrie's relatives had been born into mortality and each had become a living soul, a spirit clothed with a body. In this life, the spirit must learn to control the body. It is easy for me to understand how, under the influence of its spirit, the body grows until it reaches the stature of its spirit.
There have been billions of people on this earth and I can't even imagine how evolution could have produced a body for each person that looks just like his or her premortal spirit. Therefore, it is very difficult for me to reconcile the doctrine of man's premortal spirit (as taught by the Church today) with current theories of human evolution.