Which of the following correctly lists the stages of human development?
A. fertilized egg, blastocyst, gastrula, morula
B. fertilized egg, blastocyst, morula, gastrula
C. fertilized egg, morula, blastocyst, gastrula
D. fertilized egg, morula, gastrula, blastocyst
E. fertilized egg, gastrula, morula, blastocyst
C
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A structure that gives the sponges their phylum name
is indicated by a. A. b. B. c. C. d. D. e. E.
Physical exercise normally accounts for a _________ proportion of total energy expenditure.
Fill in the blank(s) with the appropriate word(s).
The failure of a seedling to turn green if grown in the dark is an example of:
a) incomplete dominance. b) interaction between codominant alleles. c) a lack of the chroloplast gene. d) pleiotropy. e) interaction between genotype and environment.
A fossil is defined most broadly as:
a) a piece of an organism that has turned into rock. b) the preserved pieces of hard parts (e.g., shell or bone) of extinct animals. c) the process of preservation of intact animal bodies. d) any preserved remnant or trace of an organism from the past. e) the preserved bones of vertebrates.