As a fertilized egg divides, the cells differentiate because they

1. The carbon-based macromolecules found in all organisms may be classified in four basic types

Where does food go after it leaves the small intestine?

How do fraternal twins form? A - two eggs are fertilized by one sperm B - two sperm fertilize an egg C - A fertilized egg splits in two D - two eggs are fertilized by two sperm

Mucus occurs in both the respiratory and digestive tracts. what is its main immunological function? mucus occurs in both the respiratory and digestive tracts.

During reflection, waves are sent A. Into atmosphere B. In several directions at once C. In a direction parallel to the tide D. In the direction from which they came

In which process can glucose transport reach saturation?

Which term refers to contrasting forms of the same gene

If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells A. it would be much longer before cardiac cells could respond to a second stimulation B.

The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions.

What effect would overfishing most likely have on a population of fish in a lake? A-cause a gene flow to occur in the population. B-create a bottleneck effect, reducing genetic diversity. C-create a founder effect, restricting genetic variation.