If the oort cloud contains 1012 comets, and ten new comets are discovered coming close to the sun each year, what percentage of the comets have been "used up" since the beginning of the solar system?

Which of the following are the functions of the skeletal system? blood cell production in soft marrow tissues and mineral reserves largest organ of the body for defense and support vitamin d production and pumping blood through vessels voluntary movement and contractile movement

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

What is the phylum of soft bodied animals with a true bosy cavity and a three part body consisting of a foot visceral mass and a mantle