The movement of food from the stomach into the esophagus is usually prevent by the sphincter
The correct answer is amygdala.
The amygdala is the part of the limbic system of the brain located within the temporal lobe. The functions of the amygdala include the processing of memory, emotional responses (fear, anxiety, and aggression), decisions.. It’s also a brain structure involved in turning on the stress response and actions that are related to stress and self-defense.
The variation in beak type enables the different individuals in a population to feed on different food sources.
The shape of the beak is key to determining the primary food source of the bird. Certain birds species have specialized beaks, but within populations of those species, there is a variation in beak shape.
This gives the population the ability to respond to changes in the environment and availability of different food sources.
For example, if because of a dry period there is a shortage of fruit, some individuals in the population have the beaks that enable them to feed on other things, survive and leave offspring.
B. Leaf cells. Because the rest aren’t right I think
