Which is an example of a covalent bond

Need an answer asap 45 points and brainlest to the first person to answer why do scientific theories, such as biological and chemical evolution, represent the strongest explanation of the changes observed in the fossil record. must be in sentence form how can scientific theories on evolution and the fossil record change over time? must be in sentence form

What is used to keep track of the gamates and possible offsprings combination

Which of the following are the functions of the integumentary system? yadda-yadda, the 1st answer is the brainliest. : )