Hydrilla, an invasive freshwater plant. How did Hydrilla migrate from Asia/Australia to North America. When did...
Hydrilla, an invasive freshwater plant. How did Hydrilla migrate from Asia/Australia to North America. When did this occur?
Homework Answers
first time hydrilla was introduced in U.S. in 1960s through the aquarium trade . hydrilla is dispersed vegetatively mainly by waterfowl and tailored boats. when drag lines washed it away, hydrilla grows back promptly.
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Hydrilla, an invasive freshwater plant. How did Hydrilla migrate
from Asia/Australia to North America. When did...
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5) Many songbirds breed in North America in the spring and summer, and then migrate to Central and South America in the fall. They spend the winter in these warmer areas where they feed and prepare for the spring migration north and another breeding season. Two hypothetical species of sparrow, A and B, overwinter together in mixed flocks in Costa Rica. In spring, species A goes to the east coast of North America, and species B goes to the west...
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4. Until recently, the plant family Dipterocarpaceae was thought to be restricted to tropical Asia, where...
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Q1: Based on your tree, from which living species did polar bears evolve from? Q2: Using branch lengths, how much total evolution (along both branches) has occurred since these two species diverged fr...
Q1: Based on your tree, from which living species did polar
bears evolve from?
Q2: Using branch lengths, how much total evolution (along both
branches) has occurred since these two species diverged from a
common ancestor?
Q3: If this mitochondrial gene evolves at a rate of 0.01
substitutions per nucleotide site per million years, how long ago
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Young men in North America and Europe, but not in Asia, tend to think they need more muscle to be attractive. One study presented 200 young American men with 100 images of men with various levels of muscle. Researchers measure level of muscle in kilograms per square meter (kg/m²) of fat-free body mass. Typical young men have about 20 kg/m². Each subject chose two images, one that represented his own level of body muscle and one that he thought represented...
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substitutions per nucleotide site per million years, how long ago
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ancestor?
Ailuropoda melanoleuca 0.0494 Helarctos malayanus 0.0494 0.015 Ursus arctos 0.0344 0.015...
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