The discovery that the brain contains specific receptors for manufactured opiate drugs such as morphine implies that the body must make an ___ substance that interacts with those same receptors.

ENDOGENOUS

Explanation: Receptors readily binds with biochemical messangers (called ligand) in the body system.

A particular receptor will only bind with a specific ligand, which translates that a specific receptors which readily binds with opiate drugs (such as morphine and oxycodone) for reducing body response to pain, must have been in the past, had an interaction with an endogenous biomolecule similar in molecular composition with that of opioid pain relievers .

1. a host loses nutrients to a parasite

2. a parasite only benefits when the host is alive (cause if the host dies the parasite dies with it )

3. producers to consumers

4. the tapeworm is a parasite

5. they convert energy from the sun (photosynthesis)

6. sunflower-robin (i think im 80% sure)

7. producer

8. consumer

9. prey

10. fresh water snails ( cause the green algea is the producer and the snails are the primary consumers and the small fish consumer so is the big fish)

the answer is: reproductively

i think i spelled it wrong lol

anyways hope i

-lavira: )