Let's revisit a question from your 5.01 assignment. It involves the TED talk you watched about creating a dinosaur from a chicken. The speaker states,
"Chickens are
dinosaurs because we are the classifiers and we classified them that way." The crowd of
scientists then laughs. Is it really as simple as his statement? In your own words, explain how a
scientist would classify an extinct species such a dinosaur. In your answer, discuss some of the
difficulties that he or she may face.

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.

The image shows a group of fish. the type of social behavior shown in the image is called