The stage that scientists begin to ask questions and attempt to explain observations is A. forming hypotheses. This is because a hypothesis is basically a testable question about observations scientists make.
Answer:
<em>Slay:</em><em> </em><em>To </em><em>kill</em><em> </em><em>(</em><em>a </em><em>person</em><em> </em><em>or</em><em> </em><em>animal)</em><em> </em><em>in </em><em>a</em><em> </em><em>violent</em><em> </em><em>way.</em><em>.</em><em>.</em>
Answer:
D. Separate ecosystems can affect each other.
Answer:
What are so called breast-cancer genes, are mutations in two genes: BRCA1 (BReast CAncer gene one) and BRCA2 (BReast CAncer gene two), and are also associated with ovaric cancer. According to the question, these genes are present in the popolation despite surgeries and deaths, and asks why. Surgeries does not eliminate the genes, they eliminate the tumors, and people can still reproduce after that. And also, most people already had offspring before they know they have cancer, so they are inheriting the mutations on the genes anyway.
Explanation:
Density-dependent regulation can be affected by factors that affect birth and death rates such as competition and predation.
