If complex life existed on another planet, would the organisms look similar to Earth's creatures?

Question:

If complex life existed on another planet, would the organisms look similar to Earth's creatures?

Composition of Other Planets:

Nowadays, a lot of research is being done to see if there is life on other planets. Robots called "rovers" are sent to Mars to collect soil samples and other data so that we can determine the composition of the planet. This is called "sample catching". There have been seven rover missions in the past decade.

Answer and Explanation:

The environment and surroundings have a lot to do with what an organism or species look like. For us to wonder if other complex life would look like us, we have to first figure out what the composition of the other planet is. If, for example, the other planet does not have oxygen, then the life there would have very different organs, etc (and therefore physical appearance) than us humans, who consume oxygen. It is hard to speculate the appearance of complex life on another planet without having any details about the planet's environment.


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Is There Life on Other Planets?

from Basics of Astronomy

Chapter 7 / Lesson 10
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