Answer:
They can look at the parents, and see their color and compare
Explanation:
Answer:
evolution is the gradual development of something especially from a simple to a more complex form. An example is how cell phones changed over time
Explanation:
<span>13.5%
Let's just add up the areas.
Left arm, front and back - 4.5% * 2 = 9%
from elbow to fingertips. So only half of the left arm is burned. so 9%/2 = 4.5%
Left chest and abdomen. Both the chest and abdomen are 9% each, but only half is burned. So (9+9)/2 = 9
So the total area burned is 4.5 + 9 = 13.5%</span>
<u>Answer</u>:- The three forms of nitrogen in an aquarium are
1. Nitrate NO3-
2Nitrite NO2-
3. Ammonia NH3
<u>Explanation</u>:
- The waste products produced by fishes is broken down into ammonia which is highly toxic for the fishes present in the aquarium.
- The nitrogen cycle takes place in the aquarium to convert this toxic <em>ammonia</em> into lesser toxic forms.
- This nitrogen cycle proceeds to convert ammonia into <em>nitrite</em> and then nitrite into <em>nitrate</em>. This means the cycle is ammonia——>nitrite——> nitrate.
- This conversion takes place with the help of several bacteria which establish a colony in the filter bed of the aquarium in the presence of ammonia .Then these bacteria help to finally convert ammonia to nitirite and then to nitrate.
- The bacteria that convert ammonia to nitrite are oxygen loving bacteria called as <em>Nitrosomonas</em>. The nitrite so formed is less toxic as compared to ammonia.
- The conversion of nitrite to nitrate takes place by the bacterial species called as <em>Nitrobacter</em> . The nitrate thus formed is harmless for the aquarium fishes at low levels.
Thus, in this nitrogen cycle we can see that<em> there are three different forms in which nitrogen is present- ammonia, nitrate and nitrite.</em>