That would be. All of the above.
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.'
Answer:
I'm pretty sure it's the white blood cells, because they contain antibodies to neutralise the pathogen :)
Answer:
c
Explanation:
the mantle is the layer where there are materials are melted
