Various types of glands form a part of the alimentary tube wall or duct their secretions into it. a. True
b. False

a Verdadero

Explanation:

Existen varias glándulas complejas asociadas al tubo digestivo: glándulas salivales, el páncreas y el hígado, que proporcionan secreciones para la digestión o emulsión de los alimentos. Las glándulas salivales y el páncreas están formados por glándulas acinares.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.