In cell differentiation, the trophoblast will eventually become the
A) heart and lungs.
B) spinal cord and brain.
C) amniotic sac, placenta, and umbilical cord.
D) limb buds.
C
You might also like to view...
The defining feature of a survival reflex is that it
a. has clear adaptive value. b. is linked to eating. c. is learned in the first three months after birth. d. does not fade with age.
A __________ study tests the same group of individuals over a long period of time
a. cross sectional b. longitudinal c. cross sequential d. cohort
Jenna's parents typically do not intervene when she argues with her sister. Her parents' lack of intervention is likely to
a. cause the conflicts to cease on their own. b. lead to fewer altercations between the girls. c. lead to the alienation of one of the girls. d. cause the conflicts to continue.
Extensive research investigating the effects of sleep deprivation indicates that
a. there are no long-term physiological stress effects associated with sleep deprivation. b. sleep-deprived individuals have lowered sex drives. c. there are increases in physiological stress associated with sleep deprivation. d. there are long-term emotional effects associated with sleep deprivation. e. it has a marked effect on the ability to perform physical exercise.