Has an iron ion (and it's called haem btw)
<span>the one that best summarizes the concept of natural selection is : c. the fittest organisms survive and reproduce
take girrafe for example. In the past, there were girrafes with long necks and there were girrafe with short necks. The girrafe with short necks were unfit to live in the environment where they obtain their foods from taller trees. So , only the long necked one that managed to survive and reproduce</span>
Answer:
b. ecosystems in a region, species in an ecosystem, and genes and alleles in a species.
Explanation:
Biodiversity has three levels - ecosystem, species and genetic diversity. Therefore, Biodiversity can be defined as the variability among living organisms involving terrestrial, marine, and other aquatic ecosystems, genes and alleles in a species and their ecological complexes such as diversity within species, and between species of the ecosystems.
<span>A fast-flowing river of air that forms when two air masses of very different temperatures meet is called B. jet stream.
These types of streams are often meandering, and can be found on some planets, not only the Earth.
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DNA uses deoxyribose, while RNA uses ribose. DNA is double-stranded, RNA is single-stranded. DNA is helical (spiraled), while RNA generally isn’t. DNA’s bases include thymine but not uracil, while RNA’s bases include uracil, but not thymine.
