My Crossword Maker Logo
Powered by BrightSprout
Save Status:
or to save your progress. The page will not refresh.
Controls:
SPACEBAR SWITCHES TYPING DIRECTION
Answer Key:
Edit a Copy:
Make Your Own:
Crossword Word Search Worksheet
Rate This Puzzle:
Log in or sign up to rate this puzzle.

Wednesday Challenge: Natural Selection

You may use your notes to help you with this.
Also, pay attention to the titles of your modules.
Across
Hemoglobin protein carries oxygen in all mammals is this kind of trait
Natural selection is driven by selection ___
Mechanism by which organisms are best suited to their environment
Ostrich legs are built to reach speeds of 70 mph to outrun predators is an example of this kind of trait
Selection pressures include competition, prediction, environment, climate, food availability, and ______
Down
Male lions kill offspring of other male lions is an example of this kind of trait
A condition required for natural selection to occur involving many offspring
Differences in DNA due to mutations and sexual reproduction
An organism's ability to ___ and survive and have its offspring survive
Type of descent which passes on beneficial traits to the next generations
Survival of the fittest is important to a population to remove inferior___ from the gene pool
Traits are based on improving this