The answer is A. Commensalism
refers to relationships between organism where one benefits while the other
is unaffected. The relationship is also not
obligatory. In this case, the hippo is unaffected
while the catfish benefit from its feces. The other choices involve mutualism.
Answer:
The answer is B. Two long tails
Explanation:
"Two long tails extend from the edge of the spiral pattern [of the Milky Way] and trail out beyond the galaxy, giving an indication of the Milky Way's direction of rotation."
This is a sentence taken out of my studying book.
C. I believe this is correct
Answer:
MOON
The Moon is Earth's only permanent natural satellite. It is the fifth-largest natural satellite in the Solar System, and the largest among planetary satellites relative to the size of the planet that it orbits.
The Moon is the second-densest satellite.
The Moon always shows Earth the same face.
PLANETS
A planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.
Perpetual?
it means to describe something that never ends or changes
