NEED HELP WITH THIS PLEASE AND THANK YOU list the stars in order from oldest to youngest
super giants
giants
main sequence
white dwarfs

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters

Match the reproductive structures based on their function and the system to which they belong. egg ovary sperm vas deferens vagina fallopian tube testis urethra