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“All cells, whether they are normal or cancerous, need energy. Cel division actually requires more energy than many other cell activities. Imagine that each cell in your sample needs two units of energy to divide.”

a) compare the amount of energy used by cells in each sample at 90 days.

b) how might this energy requirement affect an individual who has a cancerous tumour?

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