3.
the model shows stem cells and the many differen
ells and the many different types of cells they may become.
stem cells
cardiac cells
muscle cells
soo
intestinal cells
blood cells
liver cells
nerve cells
which statement describes the stem cells and how they become new types of cells?
a
b
they are embryonic stem cells that differentiate based on the expression of specific genes
and the influence of external chemical signals.
they are adult stem cells that replicate based on the expression of specific genes and the
influence of external chemical signals.
they are embryonic stem cells that differentiate into cell types similar to their tissue of origin
when their dna mutates.
they are adult stem cells that replicate into cell types similar to their tissue of origin when
their dna mutates.
c
d

tsd is temerature dependent sex determination.

tsd: it is a type of environmental sex determination in which the temperature experienced during embryonic/ larval development (ambient temperature for development) determine the sex of the offspring.

crocodile displays the tsd where the ambient temperature of the developing egg determines the individual's sex. for example in the american alligator's eggs, incubation at 33 ºc produces mostly males, while incubation at 30 ºc produces mostly females. so if the american alligator's egg will get the ambient temperature (33 degree celcius)during embryonic development from egg, the offspring will be male and same for the female sex determination.

find out why you don't need to aim at such a syllable pattern in english. you may have thought that haiku was supposed to be 5-7-5, so what's up with the logo by the gravitational pull of celestial objects, can touch us in unexpected ways.