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The first life forms to appear on earth were ________________.

Why are ferns considered incompletely adapted to the terrestrial environment, when compared with other plants?

Prokaryotes stain as Gram-positive or Gram-negative because of differences in the _______.    

Angiosperms are flowering plants

Unicellular fungi are called yeast

A golfer learned from his coach during a practice break that 70% of the 30 balls he hit landed on the green. This is an example of the _______ feedback.

Use the following information to answer the question.A plantlike species on the hypothetical planet Pandora has three genetic traits: leaf color, controlled by gene L; a stem texture, controlled by gene S; and root length controlled by gene R. Each of the three genes has two alleles. The three genes are linked and recombine.A geneticist performed a testcross with an organism of that species that is heterozygous for the three traits. She recorded progeny with the following phenotypic distribution: Phenotypes Leaves Stems Roots Number 1 l S R 14 2 l S r 0 3 l s R 32 4 l s r 440 5 L s R 0 6 L s r 16 7 L S r 28 8 L S R 470 ​ ​ ​ Total 1,000 Assuming that genetic inheritance for this hypothetical plant functions the same as on Earth, the parents in this cross most likely have the same phenotypes as which of the following progeny?

The “pump handle” motion of the upper ribs occurs primarily in what plane of motion?

Which statement best represents the meaning of the term evolution:  

All of the following are general observation of natural selection, EXCEPT: