In most protostomes, the blastopore develops into the:a
gut.
b. anus.
c. nostril.
d. mouth.
e. coelom.
d
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In Drosophila, the cells created by cleavage contain different developmental signals from the egg called cytoplasmic
A. stem cells. B. signals. C. determinants. D. junctions.
Which of the following is not the correct combination of plant tissue and function in a leaf?
A. epidermis: covering of leaf surface B. mesophyll: photosynthetic cells C. veins: vascular tissue D. epidermis: protection E. mesophyll: leaf surface
Why is haplotype diversity greatest in Africa?
A. Human populations that migrated only took a subset of the variable human haplotypes. B. African populations had a greater mutation rate. C. Migrating populations had less recombination. D. Populations migrated to better environments where there was a lower mutation rate. E. Most migrating populations died out.
Which description applies to broadleaf deciduous trees of temperate forests?
A) They drop their leaves as they freeze solid. B) They reabsorb chlorophyll, resulting in the colorful autumn pigments becoming visible. C) They grow slower than narrow-leaved trees during summer months. D) They are the only type of plant life found in this biome.