In general, asexual reproduction is used by organisms.
a.
underwater
b.
complex
c.
simple
d.
extinct

C.  simple

Explanation:

Simple organisms like prokaryotes which include bacteria prefer asexual mode of reproduction. There are various ways through which simple organisms can reproduce asexually like binary fission, budding fragmentation etc. The reason why simpler organisms prefer asexual mode of reproduction is because energetically it is less demanding mode of reproduction. As compared to sexual reproduction, asexual reproduction utilizes less ATPs. Apart from this, a large number of progeny can be reproduced in very short interval of time through asexual reproduction.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.