Answer:
D) It contains compounds and is therefore a substance
Explanation:
A mixture is composed of multiple compounds.
There will be an error in the DNA code
Answer:
Red algae - acquired plastids by secondary endosymbiosis
Explanation:
Red algae are believed to have undergo a primary endosymbiosis event. Then a second endosymbiosis event created a large group known as heterokonts. During the primary endosymbiosis event red algae acquire their plastids.
Answer:
a. food pellet
Explanation:
In classical conditioning, an unconditioned stimulus is the stimulus that naturally elicits an unconditioned response. The unconditioned stimulus is usually paired with a neutral stimulus, and after pairing with a neutral stimulus, the neutral stimulus becomes a conditioned stimulus that elicits a conditioned response alone.
In the experiment described above in the question, <em>the unconditioned stimulus is the food pellet,</em> which naturally elicits the response of the rat to wait at the far left corner of the cage. The neutral stimulus which is paired with the food pellet is the vanilla scent, which now becomes the conditioned response, when paired alone.
