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  • AP BIOLOGY 2013 SCORING GUIDELINES - College Board
    transitional species is most likely between 363 million years old and 380 million years old The response earned 1 point in part (b) for describing a fossil of a species with leg-like bone structures Sample: 3C Score: 2 The response earned 1 in part (a) point for selecting the rock sample that is 370 million years old
  • How many plant species are there in the world? Scientists now . . .
    There are about 391,000 species of vascular plants currently known to science, of which about 369,000 species (or 94 percent) are flowering plants, according to a report by the Royal Botanic
  • Macroinvertebrate Identification Key - Stroud Water Research . . .
    Macroinvertebrates are animals without a backbone that can be seen with the naked eye These bottom-dwelling animals include crustaceans and worms, but most are aquatic insects Beetles, caddisflies, stoneflies, mayflies, […]
  • The phylum Vertebrata: a case for zoological recognition
    The group Vertebrata is currently placed as a subphylum in the phylum Chordata, together with two other subphyla, Cephalochordata (lancelets) and Urochordata (ascidians) The past three decades, have seen extraordinary advances in zoological taxonomy and the time is now ripe for reassessing whether the subphylum position is truly appropriate for vertebrates, particularly in light of recent
  • PNAS
    Explore the immense biodiversity of soil, uncovering the variety of organisms inhabiting this vital habitat and their ecological significance
  • 7. 6 Water Quality Modifications - Washington Department of . . .
    invertebrates, and that has been done mostly on marine species A substantial amount of information is available regarding tolerances of HCP species (particularly salmonids) to thermal stress These effects have been documented in many studies, which have been well summarized in meta-analyses In the case of salmonids,
  • Animal sexual behaviour - Wikipedia
    For example, while over 90% of birds are socially monogamous, "on average, 30% or more of the baby birds in any nest [are] sired by someone other than the resident male " [17] Patricia Adair Gowaty has estimated that, out of 180 different species of socially monogamous songbirds, only 10% are sexually monogamous [18]





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