We should expect that the rat will have have more difficulty in learning the task compared to a normal rat. This is because the rat has been injected with a certain drug that oppresses the dopamine activity. And then the rat is placed in an operant chamber where a lever-pressing task is shaped through positive reinforcement.
This question is incomplete. The options are:
a. Oligocene b. Eocenec. Miocene<span>d. Pleistocene
</span>Option b is correct. This relates to the Paleocene-Eocene Thermal Maximum (PETM) which occured around 56 million years ago and was similar to modern-day climate change. Warming of more than 5 degrees Celcius occured over<span> 15-20 thousand years because of input of more than 2000 gigatons of carbon into the atmosphere. The PETM resulted in mass deep ocean extinctions and mass terrestrial and shallow ocean diversification.</span>
The level of succession which involves a small snake is found eating a cricket in a grassland is a Secondary succession.
<h3>What is Secondary succession?</h3>
This is the type of succession which involves an area previously occupied by living things is disturbed or disrupted.
The grassland area has been occupied with living things already which makes it a secondary succession.
Read more about Secondary succession here brainly.com/question/520254
Don't listen to the other answer (if it's still there) the answer is C. Winter
