Problem 4 - Biology: The Dynamic Science

Question

The esophagus, crop, gizzard, and intestine are found in: a. birds and mammals. b. insects and mammals. c. flatworms and birds. d. earthworms and birds. e. sponges and cnidarians.

Step-by-Step Solution

Answer

The correct answer is D. Both birds and earthworms have the esophagus, crop, gizzard, and intestine in their digestive systems.

Step 1: Examining Answer A

Birds contain the mentioned parts while mammals do not have a crop or gizzard. This part helps birds grind their food, a process that mammals perform using their teeth. So, the answer is not A.

Step 2: Examining Answer B

Mammals don't have a crop or gizzard, while insects have a different digestion system that doesn't include these parts. So, the answer can't be B.

Step 3: Examining Answer C

Birds have all these parts but flatworms don't. Flatworms have a primitive digestive system usually with one opening. So, the answer can't be C.

Step 4: Examining Answer D

Both birds and earthworms have these parts in their digestive systems. Earthworms have a crop and gizzard that are used to store and grind food. So, this could be the correct answer.

Step 5: Examining Answer E

Sponges and cnidarians have vastly different digestion systems and do not have these specific parts. So, the answer is definitely not E.