7. Heat
8. Coal
9. Silicon
11. Weathering
12. Chemical weathering
The difference is that thymine is replaced by Uralic in mRNA.
Answer:
add fur or fat to increase insulation
Explanation:
The endothermic animals are the animals that have developed an internal heating mechanism. This basically means that these animals do not depend on their environment for heat, but instead they produce it themselves. In order to be able to better produce their energy and keep it, these animals have developed traits that help them to increase the insulation, such as gaining on fat, fur, or feathers. The mammals are a prime example of endothermic animals, which is why they are successful in any type of environment.
A single variable.
In an experiment we are trying to figure out how one thing (independent) effects another thing (dependent) so we want to keep everything constant. We want that experiment to be controlled so nothing else is effecting our dependent variable. That way we can be 100% sure that any change to our dependent is due to our independent variable. Hope that makes sense