Which of the following features is unique to chordates?
A) bilateral symmetry
B) a coelom
C) a notochord
D) a complete digestive tract including an anus
Answer: C
Biology & Microbiology
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Which specialized cells receive and respond to stimuli?
A) effectors B) neurotransmitters C) neurons D) nerve impulses
Biology & Microbiology
The "big bang" that produced the universe is thought to have occurred
A) 40 to 50 billion years ago. B) 12 to 14 billion years ago. C) 4.6 billion years ago. D) 4 million years ago.
Biology & Microbiology
Which group of animals is the most recent to evolve?
A) reptiles B) amphibians C) invertebrates D) mammals
Biology & Microbiology
Studying the total amount of oxygen generated and released into the atmosphere by living things would be an example of studying ecology at which level?
A) ecosystem B) community C) population D) biosphere
Biology & Microbiology