Regarding megafaunal extinctions, it is assumed that the driving factor was
A. climate change.
B. the Ice Age.
C. Homo sapiens.
D. a meteorite.
E. rising sea levels.
C. Homo sapiens.
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A mountain stream can be divided into several sections. In each of these sections the biological diversity varies greatly. What factors influence the diversity in this mountain stream?
What will be an ideal response?
The embryonic skeleton consists of
a. bone and ligaments. b. cartilage and tendons. c. cartilage and membranes. d. cartilage and ligaments. e. bone and membranes.
Answer the following questions true (T) or false (F)
1. An antigen may consist of multiple epitopes, each of which recognized by different lymphocytes. 2. Allorecognition occurs when B and T cells are screened for self-tolerance. 3. Graft-versus-host disease occurs when transplanted bone marrow gives rise to B and T cells that attack the recipient's tissues.
Which of the following has the smallest ecological footprint?
A) United States B) Canada C) Finland D) Qatar E) Bangladesh