Given the following images, choose the one that most likely represents a b-class star.

a

b

c

d

Option B

A B star is a large, luminous, blue-white star of spectral type B with a surface temperature of 10,200 to 30,000°C. These stars have from 2 to 16 times the mass of the Sun and these type stars are extremely luminous and blue. Since option B shows a blue color that is why we can say that this is the correct choice.

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.

d) center of the mid-ocean ridge

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