Which of the following would change a boat's center of gravity?
a. change the material it is made from
b. put a small cabin directly over the current center of gravity
c. add two small anchors on the outside middle of the boat, one on starboard (right), one on port (left)
d. lengthen the mast (the large pole that holds the sail), which is located on the back of the boat

In 1859, charles darwin published the first edition of on the origin of species, which explained his observations of various groups of animals that showed great similarities but minor differences. darwin concluded that if a population of one species separates into two different populations that live in separate locations, then over the course of many generations the different populations can develop into different species. this idea predicted many future biological findings and became the basis of modern biology. darwin’s explanation for why different species exist is best described as a(n) law. theory. inquiry. hypothesis.