Which of the following is a characteristic of conifers?
a. needle-like leaves
b. palm-like leaves
c. fan-shaped leaves
d. broad leaves
a. needle-like leaves
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The interlocking rib cage of Tiktaalik roseae suggests that this transitional organism had lungs. What other traits were found in T. roseae, but not in its ancestral form?
A. An upright stance. B. Wings and scales. C. Primitive wrist and finger-like bones. D. Live young and fins. E. Articulating hip bones.
Which of the following describes a trophoblast?
a. the outer layer of blastocyst cells b. a combination of Z and W chromosomes c. the inner layer of blastocyst cells d. a fertilized egg retained in the female
Which type of ecosystem has low primary production but nonetheless contributes a large proportion of Earth's total net primary production?
A) tropical rain forest B) coral reef C) open ocean D) desert
Hematopoiesis occurs in different organs at different periods in development. Which of the following is the correct set of organs, in the correct order?
A. Liver - Spleen - Bone Marrow B. Spleen - Liver - Bone Marrow C. Liver - Yolk Sac - Spleen - Bone Marrow D. Yolk Sac - Liver - Spleen - Bone Marrow E. Yolk Sac - Spleen - Liver - Bone Marrow