The seasons are caused by the tilt of the Earth on its axis is the correct answer.
Summer starts based off each countries calendar so that can't be right. And during Summer days are longer because we have more sunlight so that one isn't right. And as the earth revolves around the sun it stays in relatively the same distance away so that one is incorrect.
Hope this helps. (;
1. exercise because you are using exercise to affect the amount of concentration. 2. concentration because concentration is what is being measured
Answer:
Explanation:
The maximum theoretical efficiency for a heat engine is given by the Carnot's Cycle. The temperatures of the hot reservoir and the cold reservoir at 1.0 atmosphere are 373.15 K and 273.15 K, respectively. Then:
1) The rate of percolation would be 0.33 ml/s
Percolation rate = volume of water/time
= 600/1800s
= 0.33 ml/s
2) The percentage of water absorbed would be 40%
Percentage of water absorbed = amount absorbed/total water x 100
amount of water absorbed = 100 - 60
= 40 ml
total amount of water = 100 ml
Percentage of water absorbed = 40/100 x 100
= 40%
More on numerical calculations can be found here; brainly.com/question/24638543?referrer=searchResults
1.B
2.A
3.B
4.A
5.B
6.B
7.A
Natural selection is what nature it self makes to enhance or mutate the species for survival of the finest but selective breeding is where humans mutate animals or plants to make them better, whether of use or taste, for our use.