Darwin observed how farmers and breeders produced many kinds of farm animals and plants. these plants and animals had traits that were desired by the farmers and breeders. he also noticed how the study of similar body structures and vestigial organs could add to the evidence of evolution. after performing several breeding experiments, he came to certain conclusions and formulated some theories. his theory of evolution and natural selection is the most accepted one.

Answer cumulus clouds;

Ba rock that formed 1,400 million years ago!

In a right-angled triangle: 1- the hypotenuse is the longest side2- we can apply pythagorean rule which states that: (hypotenuse)^2 = (side1)^2 + (side2)^2for the given triangle,longest side is 15 cm  side1 = 9 cmside2 is 12 cm  to check whether the triangle is right-angled or not,compare (15)^2 to the summation of (9)^2 and (12)^in other words, compare 225 to the summation of 81 and 144if they are both equal, then the triangle is right-angles, otherwise, it is not.you haven't provided the diagram showing her work, so i cannot tell the choice. however, apply my explanation to the question you have.