Nitrogen occurs in air as N2 which is not readily available to organisms.
Many elements occur in nature in various forms. Not all forms in which elements occur in nature are usable. Some forms in which elements occurs can not be used unless they undergo some kind of extraction and purification process.
Two elements are abundant in nature but not in a readily available/usable form are nitrogen and silicon. Nitrogen occurs in air as N2 which is not readily available to organisms. Silicon abundant in soil and is used in making glass but must be processed before it can be used.
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Answer:
All of the above are possible proximate causes of the behavior
Explanation:
Cats have reproductive organs, these organs go through a normal cycle, called heat cycle, that let reproduction to occur. During this cycle, they have hormonal fluctuations that mean that their body is ready to breed.
During the heat cycle, cats have several behaviors and signs such as spraying urine, rolling on the floor and scratching at doors begging to go outside. When a female cat is in heat, she is likely to urine more frequently and even spray urine on objects, <u>to let any nearby male cats know that she is ready to be mated with</u>. The urine contains pheromones and hormones, signals of her reproductive status to other male cats.
In the wild, females cats pee on trees or objects <u>to find a male cat to mate with</u>. This is why one might infer that <u>female cats did this in the past </u>and the domestic cats inherited this behavior.
Answer:
[_] [R] [R]
[R] [RR] [RR]
[r] [Rr] [Rr]
Explanation:
Hope this helps! That's the best I can do with limited resources.
Answer:
The correct answer is D the frequency of O allele is 0.66
Explanation:
The correct answer is D because
A the heterozygote frequency is 0.55.
C the UU genotype frequency is 0.44.
D O allele frequency is 0.66.
E All genotype frequency sums up to 1.
Answer:
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