Humans, crocodiles, bats, whales, and birds have similar limb bones. what do these similarities suggest?

a.
humans, bats, and crocodiles share an ancestor with whales but not with birds.

b.
humans, crocodiles, bats, whales, and birds evolved from a common ancestor.

c. a similar limb structure evolved in each species independently and by chance.

d.
the common ancestor of a human and a bird was a whale.

The correct answer is B.

Humans, crocodiles, bats, whales, and birds evolved from a common ancestor.

Explanation:

I just took the test so that is how I know, also if you look at all their structures they are similar and diffrent but they are diffrent because there bodies had to adapt to the food and place they were living in.

i think the answer is 95 hope this

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.