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Biology
The Barton Springs salamander is an endangered species found only in a single spring in the city of Austin, Texas. There is growing concern that a chemical spill on a nearby freeway could pollute the spring and wipe out the species. To provide a source of salamanders to repopulate the spring in the event of such a catastrophe, a proposal has been made to establish a captive breeding population of the salamander in a local zoo. Suppose you are asked to provide a plan for establishing this captive breeding population, with the goal of maintaining as much of the genetic variation of the species as possible in the captive population. What factors are likely to lead to a loss of genetic variation in the captive population?
What organism has been found in the oldest fossils? A.fish B.ferns C.humans D.cyanobacteria
A single strand of a DNA helix has the code ATAGGC. What would be the complementary code on the other strand of the helix?
The moon's gravitational field primarily causes:
Use the meanings of the word parts to determine which term describes a desert plant, such as a cactus: mesophyte, hydrophyte, or xerophyte.
If an organism has alleles Bb, it is: a. recessive b. heterozygous c. homozygous d. none of the above
Humans use selective breeding to pass desired _______________ on to the next generation of organisms. a. chromosomes c. gametes b. alleles d. traits
What effects does hydrogen bonding and polarity have on water?
1. volcanoes are openings in earth's crust where lava,gas,and ash can erupt. where are active volcanoes located.
vital organs are protected from harm by a. muscles b.bones c.tendons d.ligaments
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