Need answers fast
true or false: when placing a fulcrum in a lever, to get the greatest mechanical advantage, you would need to make the length of the effort arm greater than the length of the load arm. why

There are only about 250,000 known fossil species. true or false

Which of the following is the best definition of a eukaryota? a. a one-celled organism that does not have a membrane-bound nucleus b. a one-celled organism that does not have a cell wall c. an organism whose cells each contain a membrane-bound nucleus d. an organism whose cells each have a cell wall

In order for you to hold your breath, your nervous system must send messages to your a. respiratory system b. digestive system c. heart in your cardiovascular system d. check in your muscular system