The researchers hypothesize that crossing any unaffected female and an affected male will result in a
0% chance of producing an affected male offspring. Evaluate the validity of the hypothesis.

The researchers hypothesize that crossing any unaffected female and an affected male will result in a  0% chance of producing an affected male offspring - The hypothesis is correct

In the case of X-linked traits we know the following facts:

Thus, The researchers hypothesize that crossing any unaffected female and an affected male will result in a  0% chance of producing an affected male offspring - The hypothesis is correct

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This hypothesis is correct.

Explanation:

The male organism has one X chromosome and one Y chromosome while female organism has two X chromosomes. If the X chromosome is affected by certain disorder so the male offspring will have 0 % chance of disorder because only Y chromosome is inherent to the male offspring from parents while the daughter offspring has this disorder due to the inheritance of one X  from the male parent which is the affected one. So the hypothesis is true.

rising sea temps which are causing coral reefs to bleach and die out

glaciers are melting causing sea levels to rise wgich could flood out land

explanation:

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.