<u>Answer:</u>
Option (3)
The arms mostly contains old blue and blue-white stars
<u>Explanation:</u>
Spiral arms are the regions in stars extending from the middle of spiral galaxies and the barred spiral. Those long, thin areas look like a spiral and therefore give their name to spiral galaxies.
Spiral arms, though, include many young, blue stars, that render their arms so bright (due to the high mass density and the fast stellar forming rates).
There is 23 chromosomes in one gamete
Answer:
moon
Explanation:
a guess but i'm pretty sure because they study the mostly things on earth
Answer: Operant Conditioning
Some bears must have had undergone operant conditioning that is why they open their mouths for teeth cleaning and present their paws for nail clipping.
Operant conditioning is a form of learning in which a reward or punishment is given for some voluntary behavior.
Bears that have undergone operant conditioning are called food-conditioned bears. They are dangerous but learned to approach humans, or frequent human-occupied sites, in search of food (reward).
Answer:aI. 0.67. aII. Anomalous result 0.1, 20 deg, trial 2 aIII. Area increases with temperature. bI. Results support the hypothesis. bII. light intensity and duration; water conditions: pH, CO2/O2 concentration, circulation, nutrient levels, other organisms
Explanation:
missing mean = (0.6+0.6+0.8)/3=0.67
others, self-explanatory.