7. Calculate the mass of a bird flying through the sky. The bird has the kinetic energy of 5.6 J and is flying at a velocity of 15 m/s. a. 630 kg
b. 0.05 kg
c. 42 kg
d. 315 kg

Which of the following is a feature of all cells? o a. all cells have a nucleus. o b. all cells have dna for at least part of their life cycle. het . o c. all cells are spheres. o d. all cells have a rigid cell wall.