Biology, 01.08.2019 04:30 candiceforever123

Which thick layer of the heart maintains its constant pulse?

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Biology, 22.06.2019 02:00, badpotterchris

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

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Biology, 22.06.2019 10:40, karlyisaunicorn

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above

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Biology, 22.06.2019 18:30, ryanbreland14

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas

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Biology, 22.06.2019 21:40, hunterbrod9903

Abrown coat is recessive in labradors, while a black coat is dominant. if two hybrids are bred, what percentage of the offspring will have black coats? a. 25% b. 50% c. 75% d. 100%