Sometimes the form or appearance of an organism is studied to determine a taxon. the scientist is using phrenology morphology ecology phenology

Morphology

Explanation:

The study of physical appearance of the organism is known as morphology. Sometimes the scientist use the appearance as the basis to determine a taxon.

The characters such as shape, size, height and appearance comes into morphology. So, the similar appearing organisms can be put into the same category.

b.

producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls