What is the source of the large dust shells seen around some red giants and red supergiants?
A) Leftover material from their formation
B) Debris left behind by a supernova
C) Material from winds from these same stars
D) Debris left behind by passing comets
E) Star-forming molecular clouds
Question 2
Sunspots are dark splotches on the Sun. Which statement is true?
A) They are hotter than the surrounding areas of the Sun.
B) They are extremely cold objects, as cold as Pluto.
C) They are extremely hot, but cooler than the surrounding areas of the Sun.
D) They are solid bodies floating on the surface of the Sun.
E) They are associated with areas of very low magnetic fields.
The rotifer, Brachionus calyciflorus, is a large predator that consumes the smaller algae, Chlorella
(a) Feeding by bear on salmon results in large allochthonous inputs of nutrients into (b) the forest
Large water tank, possibly a public or ritual bathing area, from Mohenjo-daro, Indus Valley ...
Large families on U.S. farms used to be common. Children helped plant and harvest crops, take care ...
The presence of large areas of methane hydrate