nevejames07
12.01.2021 •
Biology
Why do gymnosperms and lower vascular plants lack companion cells?
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Ответ:
Gymnosperms and lower vascular plants have sieve cells as their sieve elements, while sieve tubes are characteristic of flowering plants angiosperms. In gymnosperms, typical companion cells are lacking in the phloem. In gymnosperms, generally the xylem contains only tracheids. Vessels are absent.
Explanation:
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Ответ:
I think that it is A
Explanation:
I'm not 100% sure because the group that contains nonmetals are F ,CI, Br, AI , and I