Some slime molds have some morphological similarities to fungi such as during times of stress they will develop into fruiting bodies that produce spores. however, dna analysis doesn't indicate a direct common ancestor, but it is thought that the similarities are due to environmental pressures, which is an example ofa. vestigial structures b. homologous structures c. divergent evolution d. convergent evolution

The correct answer will be option - D.

Explanation:

Slime moulds are the fungus-like protists which bear a structure called sporangium which produces spores.  The sporangium is produced in fungi as well due to which these protists are called fungus-like.  Although both produce sporangium but they are not closely related, rather they are distantly related organisms.

The appearance of a sporangium in both indicates that they had faced the same conditions due to which they both showed the same adaptation by producing the same structures performing the same function. In evolutionary terms, this is an example of convergent evolution.

Thus, option D is the correct answer.

d. planting trees

the trees take in carbon to make oxygen.

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.