What began as a single fertilized egg has just separated into two distinct eggs. This indicates the formation of ____ twins that has occurred during the ____ period of development.
a. fraternal; zygotic
b. fraternal; embryonic
c. identical; zygotic
d. identical; embryonic
Question 2
Who is experiencing the first indicator of the onset of puberty in a typical female?
a. Mary, whose pubic hair has started to grow
b. Terri, who has just begun to menstruate
c. Geri, whose breasts have started to grow
d. Carrie, who has just begun to ovulate
An open chamber MRI may be more comfortable for the patient, but images may not be as distinct.
A single cylinder is shown at the top and a four-cylinder engine at the bottom.
Single-cell circulation model
White and brown eggs
Each chromosome consists of a single, long molecule of DNA within which are the sequences of individ
Amoeba, a single-celled heterotroph