For organisms to be classified as the same species, they must be able to breed with each other and produce offspring.

Fertile

Explanation:

Organism belonging to different species can mate but the offspring produced will not have re productivity or fertility.

For example -

When a healthy horse and a healthy donkey mate, they produce mule. Mule is also a healthy species but is a hybrid species of the two and thus infertile.

Therefore, two organisms that belong to the same species must mate together in order to produce offspring with high re-productivity, fertility and viability.

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

haploid cells;