Answer the following question given this paragraph: Arachnids also have two additional pairs of appendages. Describe these two pairs. Q: How many additional pairs of appendages do arachnids have? Choices: - 0 - 4 - 6 - 2 A:
2
Answer the following question given this paragraph: The chemical reactions that regulate the levels of CO2 and carbonic acid occur in the lungs when blood travels through the lung's pulmonary capillaries. Minor adjustments in breathing are usually sufficient to adjust the pH of the blood by changing how much CO2 is exhaled. In fact, doubling the respiratory rate for less than 1 minute, removing "extra" CO2, would increase the blood pH by 0.2. This situation is common if you are exercising strenuously over a period of time. To keep up the necessary energy production, you would produce excess CO2 (and lactic acid if exercising beyond your aerobic threshold). In order to balance the increased acid production, the respiration rate goes up to remove the CO2. This helps to keep you from developing acidosis. The body regulates the respiratory rate by the use of chemoreceptors, which primarily use CO2 as a signal. Peripheral blood sensors are found in the walls of the aorta and carotid arteries. These sensors signal the brain to provide immediate adjustments to the respiratory rate if CO2 levels rise or fall. Yet other sensors are found in the brain itself. Changes in the pH of CSF affect the respiratory center in the medulla oblongata, which can directly modulate breathing rate to bring the pH back into the normal range. Hypercapnia, or abnormally elevated blood levels of CO2, occurs in any situation that impairs respiratory functions, including pneumonia and congestive heart failure. Reduced breathing (hypoventilation) due to drugs such as morphine, barbiturates, or ethanol (or even just holding one's breath) can also result in hypercapnia. Hypocapnia, or abnormally low blood levels of CO2, occurs with any cause of hyperventilation that drives off the CO2, such as salicylate toxicity, elevated room temperatures, fever, or hysteria. Q: What is the term for abnormally low blood levels of carbon dioxide? Choices: - spirogyra - hepatitis - trichina - hypocapnia A:
hypocapnia
Q: Answer the following question given this paragraph: Q: What is the predominant stage in the life cycle of most scyphozoans? Choices: - hydra - spore - gamete - medusa A:
A: medusa
Question: Answer the following question given this paragraph: heterotroph that eats only or mainly plants. Q: The heterotroph eats only or mainly what? Choices: - animals - roots - decomposers - plants A:
Answer: plants
*Question*
Answer the following question given this paragraph: The Diversity of Life The fact that biology, as a science, has such a broad scope has to do with the tremendous diversity of life on earth. The source of this diversity is evolution, the process of gradual change during which new species arise from older species. Evolutionary biologists study the evolution of living things in everything from the microscopic world to ecosystems. The evolution of various life forms on Earth can be summarized in a phylogenetic tree (Figure 1.17). A phylogenetic tree is a diagram showing the evolutionary relationships among biological species based on similarities and differences in genetic or physical traits or both. A phylogenetic tree is composed of nodes and branches. The internal nodes represent ancestors and are points in evolution when, based on scientific evidence, an ancestor is thought to have diverged to form two new species. The length of each branch is proportional to the time elapsed since the split. Q: What process of gradual change is the source of diversity of life on earth? Choices: - variation - creation - development - evolution A:
**Answer**
evolution
Answer the following question given this paragraph: Q: Does the force of magnetism increase or decrease as the distance between objects increases? Choices: - increase - remain stable - fluctuate - decrease A:
decrease