The fact that every organism continuously exchanges chemicals and energy with its surroundings indicates that organisms ________
A) are open systems
B) are closed systems
C) have tightly controlled thermoregulation
D) osmoregulate
A
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Which of the following are the fundamental embryonic tissues called the "germ layers"?
A. tissues, organs, and organ systems B. mesoderm, muscle, and tissue C. ectoderm, endoderm, and exoskeleton D. mesoderm, endoderm, and ectoderm E. mesoderm, exoderm, and hydroderm
Autotrophs include which of the following?
a. fungi. b. plants. c. animals. d. all of the above.
What is found when alleles among different human groups are analyzed?
A) There are no race-specific alleles and no consistent patterns of allele frequencies within racial groups. B) There are a few race-specific alleles but no consistent patterns of allele frequencies within racial groups. C) There are many race-specific alleles and several consistent patterns of allele frequencies within racial groups. D) There are no race-specific alleles but several consistent patterns of allele frequencies within racial groups.
Neural crest cells at the dorsal surface of the neural tube
A. form the notochord. B. differentiate into the brain. C. form the overlying ectoderm. D. migrate to many different regions of the body. E. control the segmentation of somatic mesoderm.