How can natural selection affect the songs that birds sing?

If spontaneous generation does not occur and the principle of biogenesis is true - what scientific question remains unanswered

Physical activity not related to a persons job is defined as?

Which statement about microorganisms is true? A. They can all be seen with the naked eye. B. They are all multicellular. C. They are all capable of making their own food. D. They all exhibit different forms and sizes.

Veins have thin and elastic muscular walls. why?

All of the following organisms share the same genus but differ in species. Mustela erminea Mustela vison Mustela nigripes

Which structure of the trachea prevents it from collapsing inward and obstructing the air passageway?

What is a Divergent boundary and where is located?

A species displaying which of the survivorship curves is likely to produce the most offspring?

When comparing dogs to wolves, scientists found evidence that supports the idea they come from a common ancestor.

Riddle: I'm mostly made of water, but that's not all. I fill up the cell, from wall to wall.