catherinesquitieri
18.10.2020 •
Biology
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Male pine cones contain:
soft scales
a sticky fluid
sperm tubes
pollen sacs
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Ответ:
Male pine cones have a sticky fluid, sperm tubes, and pollen sacs.
Explanation:
Both male and female pine cones have sperm tubes, but only females have soft scales. Male cones have rough scales that let the pollen in and out of it. Although female cones soft scales, they still allow pollen to enter into the cones. The pollen that goes into the female pine cone never gets out, though.
Ответ:
c = 180- (70+52) = 58
a/sina = c/sinc
c = a sinc/sina
c = (640 x sin58)/sin 70 = 572