In the autumn, many birds will collect seeds and then hide them in various caches throughout their habitat. the birds will guard their caches from other birds, and move the caches if they start to dry out. these caches provide a food source for the birds during the winter. what is an abiotic factor that contributed to the evolution of this set of behaviors?

Abiotic factor is defind as a nonliving condition such as climate, rain, wind, temperature, altitude, soil or habitat, which influences and affects an ecosystem and the organisms in it.

The abiotic factor that contributed to the evolution of this set of behaviors as mentioned in the question is cold winter season.

The correct answer is low temperature.

Explanation:

Abiotic factors are the non-living parts of the environment which directly influences the living organisms along with its ecosystem. They are mostly physical factors which can be easily identified like temperature, moisture, sunlight, soil type, water, sunlight and many more.

According to the given condition in which a bird do "caching" that is collecting and storing hundreds of seeds in a different location during bad weather condition which helps in the survival of the bird.  

Since the bad weather condition, in this case, is cold winter season affecting the behavior of the bird therefore, the abiotic factor is low temperature.

answer; i believe that the correct answer is ; males are hemizygous for the x chromosome;

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.