Why does the heart start pumping blood to all the cells so early in pig/human development

What is the inability of an individual or a society to achieve a minimum standard of living known as ?

Migration is a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations c. select the best answer from above

The basic types of tissue in the human body are