How are the ribs of an umbrella similar to the exoskeleton of an arthropod such as a crab? How are they different?

Ifound this on google “how does an observation of an object differ from an inference about it? observations uses one or more of the senses to gather in formation and record it but an inference is a logical interpretation of the prior knowledge like testing samples.” i hope this you for what your looking for. can you plz mark me brainliest?

The answer is b.the gaseous state is electrically positive, while the plasma state is electrically negative. 

Since the pully is a simple machine so the mechanical advantage is a 1

Iassume the answer is 75 feet. inwards to outwards rather than outwards to inwards. probably be 75.hachures are stokes drawn in direction of the steepest slope. a series of short parallel lines drawn on a map to indicate topographic relief. it is actually called hachures on contour lines. the small marks in the center of the feature are called hachures.observe the picture attached