Why must artery walls be thicker than vein walls

Where do the energy storage molecules in an ecosystem come from? (The topic is "Sunlight and Life". I'm thinking photosynthesis but I don't know for sure.

Which materials undergo radioactive decay? Check all that apply. atoms that are unstable elements that have a half-life atoms that release energy and particles elements that have turned into a new element elements that have a consistent number of

Difference between ostium and osculum

Which of the following objects is NOT a part of our solar system? A. the North Star B. the dwarf planet Pluto C. the asteroid belt D. Jupiter's moons

After spending years in the ocean, a mature salmon swims up its home river to return to its birthplace. this behavior is an example of a (n) :

Sort the variables of these three studies based on whether they are independent or dependent variables Study 1: the effect of light on flowering patterns of plants Study 2: the effect of pencillin on the growth of the E.

What idis the different between a species and a population?

Eplain I terms of osmosis why a raisin placed in a cup of water overnight will puff up with water

Why is sunlight the source for all food energy in an ecosystem?

What two digestive processes occur there?