The ____ houses the blood vessels that join the embryo and its mother.
a. umbilical cord
b. amnion
c. germ disc
d. mesoderm
Question 2
Which best describes the paternal investment theory of puberty?
a. Moms have the greatest impact on the timing of early puberty, and having a highly involved mom appears to delay its onset.
b. Moms have the greatest impact on the timing of early puberty, and having a highly involved mom appears to accelerate its onset.
c. Dads have the greatest impact on the timing of early puberty, and having a highly involved dad appears to delay its onset.
d. Dads have the greatest impact on the timing of early puberty, and having a highly involved dad appears to accelerate its onset.
red blood cells
(A) Lumbar puncture, also known as spinal tap; (B) section of the vertebral column showing the spina
White Blood Cells
Blood Flow to the Brain
Each allele of codominant genes is fully expressed in heterozygotes. Type A blood has A antigens on
Embryo After 3 Mitotic Divisions