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Mashutka [201]
3 years ago
7

The phenomenon of single or double fertilization is unique to the seed plants

Biology
1 answer:
Ksju [112]3 years ago
5 0

Answer:

Double fertilization

Explanation:

The phenomenon of double fertilization is unique to flowering plants (i.e., angiosperms). Each pollen grain produces two male gametes (sperm cells), one of which fertilizes the egg to form the zygote, whereas the other sperm fuses with polar nuclei in the female gametophyte in order to form a triploid cell (3n) called endosperm. Subsequently, this endosperm will support embryonic growth by supplying storage nutrients and by serving as a mechanical barrier during seed development and germination.

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Which process or processes are responsible for the series of ice ages that occurred during the cenozoic era?
jonny [76]

Answer:

Glaciation and the Antarctic Circumpolar current

Explanation:

As the supercontinents continued to separate, cold water was easily transported around the globe through the Antarctic Circumpolar current. This assisted periodic glaciation during the Cenozoic Era, leading to a series of ice ages.

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3 years ago
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sesenic [268]

During mitosis, chromosomes are moved and separated through the use of spindles composed of microtubule structures.

Explanation:

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8 0
3 years ago
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irina1246 [14]

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