Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?

The phylogeny chart shows the evolution of camels. camelus is the modern-day camel. based on this chart, which three statements are true? ⭕ modern camels are more related to stenomylus than to eschatius. ⭕ stenomylous and modern camels do not share a common ancestor. ⭕ modern camels are more related to camelops than to aepycamelus. ⭕ pliauchenia and oxydactylus may share similar features. ⭕ procamelus and stenomylous may share similar features.

Sweating and breathing is an example of differentiation specialization maintaining homeostasis metabolism

Is becoming less expensive to screen blood samples for dna certain diseases have genetic basis what is possible ethical concern about the availability of inexpensive dna testing