All other organs, ducts, and glands in the reproductive system are considered secondary, or accessory, reproductive organs. These structures transport and sustain the gametes and nature the developing offspring.
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POLLEN GRAIN, SEED COAT, MEGASPORANGIUM AND EMBRYO. <--- ANSWER
Gymnosperms are seed bearing plants, which do not have the combination of specialized features that characterized the flowering plants.
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Each proton and neutron has an atomic mass unit of 1 3 4 2
Answer:
There's no eclipse at every full moon and new moon because the moon's orbit is inclined to Earth's orbit by about five degrees. Most of the time, the sun, Earth and moon don't line up precisely enough to cause an eclipse.
Explanation:
During a lunar eclipse, Earth comes between the Sun and the Moon, blocking the sunlight falling on the Moon. Earth's shadow covers all or part of the lunar surface.