Which of the following has a closed circulatory system?

spider

earthworm

insect

Snail

clam

What percent of Earth water is drinkable

Why are the male gonads not found in the abdominal cavity? where are they found?

We know that not all cells are alike. Which is NOT a true statement about the difference between cells? Different cells are different sizes. Cells come in a lot of different shapes. Most cells have a membrane, though some don't.

How does the body make use of amino acids from proteins?

How is each step in the inflammatory process beneficial?

Which is a reflex response?

You decide to repeat the Meselson-Stahl experiment, except this time you plan to grow the E coli cells on light 14N medium for many generations and then transfer them to heavy 15N medium and allow them to grow for 2 additional generations (2 rounds

How long ago did oceans form

Fish starfish coral and plants are

Is the force that circulates blood electrical?