Answer:
barter trade
Explanation:
because you exchange goods
Cold blooded, lay eggs in water, and respire both by skin and lungs, and they have a three-chambered heart.
<span>blood, lungs and blood vessels that make up the circulatory system.
... The network of veins, arteries and blood vessels transports
oxygenated blood from the heart, delivers oxygen and nutrients to the
body's cells and then returns deoxygenated blood back to the heart</span>
<h2>methods:</h2>
- take an Apple
- leave it from your hand
<h2>Conclusion:</h2>
the apple will fall on the ground.. This is because of gravity.. Gravity pulls everything towards it.