1 more question anyone know why it says to select brainliest but when I go to it to mark one as brainliest or whatever, it doesn't let me. does anyone know why?

I think it's because to mark brainliest there has to be two or more answers to your question. If only one person answered than you can't award brainliest.

Hope this helps.

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

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.