keeping humans alive in space and a constant source of energy
Goddard received over 200 patents, but the two most important for space travel were liquid fuel rockets and two-stage rockets. Without these two ideas, space travel would never have happened.
animal life and health
There were two men on the first Space Shuttle flight -- John W. Young and Robert Crippen
Space travel is extermely doifficult. It involves physics, anatomy if it is a manned mission, geology if you collect rock samples, and nearly every science you can think of. There are years of planning. Astronauts are trained for two years before they can go into space. Still, there are dangers. Think about Apollo 1, Apollo 13, Challenger, Columbia. Mankind still has much to learn about space travel.
Not only in space - gravity is universal. The force of gravity is affected by the distance, and by the masses involved.
food and space
malthus
two limiting factors for a desert are water and plants because there is really no water there.
Climate,lack of shelter, sicknesses and parasites, food or water as well as the carrying capacity are examples of limiting factors.
Food and shelter
avaliability of water and the fertility of the soil. your welcome EES
The amount of resources and how big the population is.
you can not keep two males together as they do fight each other
cold weather and snowfalls.
extreme heat, very little or no water low temp. or too much rain
Goddard received over 200 patents, but the two most important for space travel were liquid fuel rockets and two-stage rockets. Without these two ideas, space travel would never have happened.
room space