In the first generation, there would be two bands, one of light density and one of heavy density. In the second generation there would still be two bands, one of light density and one of heavy density.
<span>The cell walls and membranes of archaea are made of different substances than those of other prokaryotes</span>
Answer:
Insects use air-filled tubes called tracheae to exchange oxygen and carbon dioxide between their tissues and the air. This network of tubes is also called a tracheal system. Insect body contains small openings on the outer surface called spiracles. Spiracles are connected to the internal tubes.
Answer:
C) semipermeable
Explanation:
because permeable means it allows things through, and then semi makes it to where it only allows certain things through
and Impermeable means it won't let things through and the other two options just don't make sense for the question
Answer:
space
Explanation:
they figured it out going to space and since a star is a small peice of the sun they can't touch it it's impossible without getting heat burns or dying so they ither observe a star using a telescope or went to space for days
