Number 3, CA cannot be an element, because it has 2 capital letters, meaning it contains 2 elements
<span>She is at an increased risk of osteoporosis. Girls who first experience menarche at later ages are more disposed to having a lowered bone density and osteoporosis later in life. This is due to having a reduced peak bone mass, which can increase the risks of fracture.</span>
Primary Succession is when an ecological community experiences a community changing natural disaster (volcano, glacier, etc) primary succession starts from bare rock. Secondary succession starts from pre-existing soil, and occurs from a hurricane, deforestation, etc.
Let's say a geographical barrier separates a species into two different population. Which also cause a reproductive isolation ( the two pupolations cannot interbred)
Throughout the time (lets say a million years), the two populations will undergo a lot of changes in their respective genomes and eventually will form 2 different species.
If there is no reproductive isolation, the 2 population could interbred with one another and there will be no speciation
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