Answer:
Its tree rings, pollen grains and fossils or 2,4, and 5
Explanation:
I got it right
Andre Rebelo you tube star
Sieve tube member cells are living cells, have companion cells and are typical for gymnosperms.
Tracheids have secondary cells walls and are functioning like dead tubes that enable the flow of water through the plant. Tracheid occurs in vascular plants, both angiosperms, and gymnosperms.
This is called regulating signals
there are two kinds of regulating signal first Regulating signals that tell cells to
divide can turn off or regulating signals that tell cells to stop dividing can turn
on
2nd Signals tell cells to die programmed
cell death-internal series of events).
