A frog heart has 3 chambers, 1 ventricle and 2 atria. One atrium (the right) receives deoxygenated blood from the frog's body (in the systemic circulation) and then pumped to the single ventricle wherein it will go to the lungs to be oxygenated. Another atrium (the left) received oxygenated blood from the lungs then pumped to the single ventricle wherein it will go to the systemic circulation. In the single ventricle, some form of mixing of the oxygenated and deoxygenated blood happens but since the frog is a cold blooded animal, the decrease in the concentration of oxygen is deemed superficial.
This advancement allows the frog to live on land using the lungs as the primary organ for oxygenation of the blood.
I’m pretty sure it would be Offspring A, because it looks like the parent and the parent reproduces asexually, so it is most likely it’s own traits. Hope this helps!
On the one hand, the taking of the ball up the hill is analogous to the synthesis of glucose by plants. This is because it requires expending of energy (there is an intake of energy). Energy from the sun is required in photosynthesis. This is also tantamount to raising the potential energy for later use.
On the other hand, taking the ball down the slope of the hill is analogous to the breakdown of glucose. This is because energy is given out. When the ball is moved from the top of the hill (where it had more potential energy) to a lower point on the hill, energy has been given out just as energy is released in respiration.
The sun. Greenhouse gases absorb heat better. So the more of these gases, the hotter it gets. However, the earth itself is naturally heating, but it goes too fast for live to adjust to the temperatures.