It is not what you thing it is but the answer is true
Answer:
The thermal energy of the Earth remains from its formation and is continuously generated from radioactive decay of long-lived radionuclides in the Earths interior. The deeper the Earth layers the higher the temperature with the geothermal gradient of temperatures through the Earth’s crust on average as high as 25–30°C/km.
Explanation:
A pathogen or infectious agent would be a parasite, fungi, bacteria or virus that is bad for our health. One type of pathogen or infectious agent would be the common cold. You can prevent the spread of the common cold by washing hands with antimicrobial soap often and staying away from others who are sick. Doing this would greatly reduce the chance that you'd get sick, too.
Answer:
Ecological and ethological approaches to the study of behaviour. The natural history approach of Darwin and his predecessors gradually evolved into the twin sciences of animal ecology, the study of the interactions between an animal and its environment, and ethology, the biological study of animal behaviour.