What do all bilaterians have in common? Select all correct choices
A. symmetrical right and left sides
B. a distinct back and front end
C. a brain instead of a ganglia
A,B
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Examine the flux diagrams in Figure 25.6 to address the following questions
Based on these calculations, burning fossil fuels results in [smaller / larger] inputs of atmospheric carbon than the net exchange of atmospheric carbon resulting from natural biological processes. What will be an ideal response?
Which one of the following is believed to be the major event that led to the appearance of diverse, complex multicellular organisms on Earth?
A. the increase in atmospheric oxygen B. the appearance of animals C. the appearance of plants on land D. the appearance of bulk transport systems
A lack of T cells makes one more vulnerable to intracellular parasites
Indicate whether this statement is true or false.
Which of the following lack vascular tissue?
A) cone-bearing plants B) grasses C) ferns D) mosses