Which features are found in organisms that have an incomplete digestive tract?

A. pharynx, digestive enzymes and diffusion of nutrients
B. digestive enzymes, esophagus and diffusion of nutrients
C. crop, digestive enzymes and diffusion of nutrients
D. gizzard, salivary amylase and a pharynx


Answer: A

Biology & Microbiology

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The parasitic lampreys, living members of the ____ lineage, have shards of cartilage that partially cover the nerve

cord, which may represent an early stage of the evolution of vertebrae.

a. Petromyzontoidea b. Placodermi c. Cephalochordata

d. Urochordata e. Myxinoidea

Biology & Microbiology

The net reproductive rate (R0 ) refers to the average number of females that will be produced during a lifetime by a newborn female

Indicate whether the statement is true or false

Biology & Microbiology

Which lineage includes living members associated with adaptations such as squalene, spiral valve, electroreceptors, lateral line system, and claspers?

a. Actinopterygii b. Petromyzontoidea c. Chondrichthyes d. Sarcopterygii

Biology & Microbiology

Hypotheses for the cause of autism spectrum disorders include or have included in the past ________

A) genetics B) aberrant parenting C) vaccinations D) all of the above

Biology & Microbiology