Which of the following are characteristics of arthropods?

1. protostome development
2. bilateral symmetry
3. a pseudocoelom
4. three embryonic germ layers
5. a closed circulatory system
A) 1
B) 1 and 2
C) 1, 2, and 4
D) 2, 3, 4, 5
E) 2 and 3


Answer: C

Biology & Microbiology

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Mycorrhizae are especially effective in helping plant roots uptake  

A.  nitrogen. B.  phosphorus. C.  potassium. D.  iron. E.  magnesium.

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Which gene will encode a transcription factor that will signal a cluster of embryonic cells to give rise to an appendage? a. Dlx b. All of the genes in the body help develop the appendages

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How old is our planet Earth?

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