True.
Polar bears evolved from the brown bear. Their fur mutated from dark to adapt to the colder climate and to hide in the snow. Probably, in the past, there were some bears with mutated lighter fur. This trait allowed them to survive so that mutated gene was transmitted to the next generations. Lighter fur allowed them to retain body heat and better to hide during hunting. White bears had a higher fitness than brown bears in the cold climate, so generations later, all polar bears were white.
Adaptation is when something gets used to living in certain place or a type of way.
For example a polar bear. They did not exist until when it got very cold and the bears could not survive so they had to change how they lived they adapted to their environment and the climate
The answer is D. Bacterial calls do not have chloroplasts or cell walls, but both have cell membranes ribosomes, and a nucleus.
We can confirm that Ms. Bronner is using a token economy to encourage the rule-following in her classroom.
<h3>What is a token economy?</h3>
This is a method of positive conditioning in which a token of some sort is given as a prize to reinforce positive behavior, with the idea that these tokens may then be exchanged for even greater reinforcers once a certain level is reached.
Therefore, we can confirm that since the methods being described in the questions perfectly correspond to this definition, Ms. Bronner is using a token economy to encourage the rule-following in her classroom.
To learn more about the token economy method:
brainly.com/question/17465339?referrer=searchResults
Answer:lumbar, thoracic and cervical
Explanation:
Iliocostalis muscles is the most inferior and lateral of the erector spinae muscles.
