Ans.
Steroids are defined as active organic bio-molecules, having four rings with a specific molecular configuration. Steroids play role in two major functions: as hormones or signaling molecules and as structural components of plasma membrane.
Examples of steroid hormones are estrogen, progesterone, and cortisol. Thus, the correct answer is 'option b). they serve as chemical messengers.'
Mosses, ferns, and lichens are bryophytes. They are non-vascular and non-flowering plant and have a thallus-like body. They reproduce by production f spores, inside the sporangia, and connceted to a base called as sporangiophore, which attaches it to the thallus.
<span>systematic knowledge of the physical or material world gained through observation and experimentation.</span>
