Template:Human Biology

Bilaterally symmetrical bipedal primates, Humans were a warm-blooded humanoid species. They had two hands and two feet, each of which had five digits. The Human hand featured an opposable thumb and their fingers had multiple points of articulation.

Physical Strength
On average, Humans were not as physically strong as some species such as Klingons and Vulcans. They were, however, resilient in other ways. They were more adaptable to incarceration than Klingons, they could survive with one lung or kidney, despite having two of both of these organs initially. Humans could also go days without water and weeks without food due to their bodies' ability to conserve water and live off stored fat. Their bodies' efficient temperature regulation allowed them to resist and survive cold temperatures that would adversely affect other species such as Vulcans and Klingons or high temperatures that would be uncomfortable to deadly for an Andorian.

Humans had iron-based hemoglobin in their blood. Each's individuals blood could be one of eight blood types, which included AB-positive, O-negative and B-negative.

The Human body is made up of 75% water.

Reproduction
They had two sexes, as was common to many humanoid species. The female of the species was fertile once a month after she reached puberty until the onset of a biochemical stage known as menopause. Human gestation was nine-months.

The make-up of Human DNA structure was significant, with only minor-modifications, in that it allowed them to crossbreed successfully with a wide range of other mammalian races across the galaxy, including Vulcans, Betazoids, Klingons, etc. This was in part from the fact that several different, unrelated species inter-breed with primitive Humanity, including but not limited to Hiigarans and Vulcans. This allows Humans to cross-breed with numerous other species, more than any other race and most notably without significant genetic modification or medical assistance. Regardless of the situation, Human traits tend to dominate in most offspring.

Lifespan
The average Human life span had gradually increased during their history. At one point, it was only 35 years. Modern Humans were known to live as long as 100 years with even basic medical care. With medical assistance, the average lifespan can be extended even farther.