What is a biomarker?
the color coding of different genes
a protein that is uniquely produced in a diseased state
a molecule in the genome or proteome
a marker that is genetically inherited

A marker that is genetically inherited

Explanation:

A biological marker, in the strictest sense, is a characteristic of a living being that allows us to identify it.

Examples of biomarkers are: physical (colour, size, shape, etc.) and biochemical (composition, metabolic pathways, secretions). Currently, advances in technology have allowed us to use highly precise tools, such as molecular markers: genomics (SNPs, TSR, microarrays, and others) and proteomics.

Regardless of the nature of the marker, the important thing is that it can be inherited, as this guarantees that one can identify, for example a species, by the presence of a gene, independently of the individual sampled.

the reason the two sea urchins don't compete with each other for food, resources, etc. is because the urchins have adapted to the environment but they have also adapted to each other. this is most likely because the genes of the sea urchins.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.