Which part of a plant carries substances between the roots and the leaves? cambium bark heartwood phloem

Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

Consider the equation s + o2 ? so2. what is the product? question 3 options: s so 2 s + so 2 o 2

At the age of 6 months, caleb was diagnosed with tay-sachs disease. as his primary care physician, what would you tell his parents about this disease?