Survival of the fittest is a term mainly used which states that only animals that are the best adapted will survive over an evolutionary period
Answer: The correct answer for the fill in the blank is D) Esophagus.
The digestive system is comprised of the gastrointestinal tract ( GI tract) and the accessory organs like liver, pancreas, and gallbladder.
The GI tract starts from the mouth and ends in the anus. This is a long twisting tube in which the hollow organs are joined. The hollow organs which are the part of the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus.
Food travels from the mouth to the stomach via a hollow tube-like structure which is called as Esophagus. Food is swallowed through the esophagus with the help of muscular movements called as peristalsis.
Answer:
C
Explanation:
Trilobites were alive the longest time ago, so they would be found in the oldest rock layer.
A carbon atom can form a maximum of 4 single covalent bonds