What is the name of constellations that appear to never rise or set?
a. polar constellations
b. circumference constellations
c. circular constellations
d. celestial polar constellations
e. circumpolar constellations
Question 2
Why is the term arc used to describe units of measure for angular distance?
a. To avoid confusion with the minutes and seconds of time
b. To describe the arc-shaped distance between the stars
c. To distinguish the base unit of 10 per degree
d. To distinguish the difference between northern and southern spheres
e. To describe the placement of the stars within each hemisphere
Possible symbiotic or endosymbiotic relationships that gave rise to the first eukaryotic cells
Chemosynthesis-based community on the East Pacific Rise.
Synthesis of polar head groups of bacterial phospholipids
Rising sea level: Some areas will be affected by a rise of just 40 cm
Polar Bear (Ursus maritimus) mother with cub in snow. Churchill, Canada.