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Because regular leaves don't conserve water well, the cactus developed these modified leaves to adapt to its extremely dry environment. The spines are better at conserving water and surviving in hot temperatures. Regular leaves provide a large surface area for evaporation of water to occur, the tiny spines do not.
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You can find how much the blood pumped by multiplying the heart rate with the stroke volume. The heart beats by 72 beats per minute with 70ml blood pumped per beats. Then, the number of blood pumped would be:
number of blood: heart rate * stroke volume= 72 beats/min * 70ml/beats * 60min/hour * 1liters/1000ml= 302.4 L/ hour
Answer:
Explanation:
In order to reach specific items of food that meet the dietary needs of the giraffe, they must reach for food up in the trees. Giraffes with longer necks are open to a wider array of food whereas the short necked giraffes are limited. The longer neck is seen to be more favorable. When a trait is more favorable, it has a higher likelihood of being passed on. The less favorable traits are eliminated or "weed" out and the taller giraffes mate with other tall giraffes, generating a greater population with this trait. Again, it is solely dependent on what is available around them and their surroundings.
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