*Question*
Answer the following question given this paragraph: The right atrium receives all of the systemic venous return. Most of the blood flows into either the superior vena cava or inferior vena cava. If you draw an imaginary line at the level of the diaphragm, systemic venous circulation from above that line will generally flow into the superior vena cava; this includes blood from the head, neck, chest, shoulders, and upper limbs. The exception to this is that most venous blood flow from the coronary veins flows directly into the coronary sinus and from there directly into the right atrium. Beneath the diaphragm, systemic venous flow enters the inferior vena cava, that is, blood from the abdominal and pelvic regions and the lower limbs. Q: The right atrium receives all of the systemic venous return. most of the blood flows into either the superior vena cava or this? Choices: - resulted vena cava - identical vena cava - exterior vena cava - inferior vena cava A:
**Answer**
inferior vena cava

*Question*
Answer the following question given this paragraph: Mammals are very intelligent. Of all vertebrates, they are the animals that are most capable of learning. Mammalian offspring are fed and taken care of by their parents for a relatively long time. This gives them plenty of time to learn from their parents. By learning, they can benefit from the experiences of their elders. The ability to learn is the main reason that the large mammalian brain evolved. It's also the primary reason for the success of mammals. Q: Among vertebrates, what broad category of animals is most capable of learning? Choices: - birds - fish - reptiles - mammals A:
**Answer**
mammals

*Question*
Answer the following question given this paragraph: Q: What is the term for liquid water falling from the sky? Choices: - wind - fire - mud - rain A:
**Answer**
rain

*Question*
Answer the following question given this paragraph: Plant Responses to Gravity Whether or not they germinate in the light or in total darkness, shoots usually sprout up from the ground, and roots grow downward into the ground. A plant laid on its side in the dark will send shoots upward when given enough time. Gravitropism ensures that roots grow into the soil and that shoots grow toward sunlight. Growth of the shoot apical tip upward is called negative gravitropism, whereas growth of the roots downward is called positive gravitropism. Amyloplasts (also known as statoliths) are specialized plastids that contain starch granules and settle downward in response to gravity. Amyloplasts are found in shoots and in specialized cells of the root cap. When a plant is tilted, the statoliths drop to the new bottom cell wall. A few hours later, the shoot or root will show growth in the new vertical direction. The mechanism that mediates gravitropism is reasonably well understood. When amyloplasts settle to the bottom of the gravity-sensing cells in the root or shoot, they physically contact the endoplasmic reticulum (ER), causing the release of calcium ions from inside the ER. This calcium signaling in the cells causes polar transport of the plant hormone IAA to. Q: Gravitropism ensures that roots grow into the soil and that shoots grow toward what? Choices: - the north pole - trees - the south pole - sunlight A:
**Answer**
sunlight