The first kids twin sister, with a mass of 32 kg, joins him on the see-saw.

i guess it’s a and b

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

the ima (higher than 1m) will be greater than the ima with the height of 1m.

1 is a answer of a question