Q: The colloquial term "ribbon worm" refers to the mostly marine species of what phylum? Read this paragraph and choose the correct option from the provided answers: Phylum Nemertea The Nemertea are colloquially known as ribbon worms. Most species of phylum Nemertea are marine, predominantly benthic or bottom dwellers, with an estimated 900 species known. However, nemertini have been recorded in freshwater and terrestrial habitats as well. Most nemerteans are carnivores, feeding on worms, clams, and crustaceans. Some species are scavengers, and some nemertini species, like Malacobdella grossa, have also evolved commensalistic relationships with some mollusks. Some species have devastated commercial fishing of clams and crabs. Nemerteans have almost no predators and two species are sold as fish bait. Morphology Ribbon worms vary in size from 1 cm to several meters. They show bilateral symmetry and remarkable contractile properties. Because of their contractility, they can change their morphological presentation in response to environmental cues. Animals in phylum Nemertea show a flattened morphology, that is, they are flat from front to back, like a flattened tube. Nemertea are soft and unsegmented animals (Figure 28.18). Choices: - nematoida - lophophorata - gnathifera - nemertea A:
nemertea

Q: Nitrogen wastes are produced by the breakdown of what during normal metabolism? Read this paragraph and choose the correct option from the provided answers: Regulation of Nitrogen Wastes Nitrogen wastes are produced by the breakdown of proteins during normal metabolism. Proteins are broken down into amino acids, which in turn are deaminated by having their nitrogen groups removed. Deamination converts the amino (NH2) groups into ammonia (NH3), ammonium ion (NH4+), urea, or uric acid (Figure 25.22). Ammonia is extremely toxic, so most of it is very rapidly converted into urea in the liver. Human urinary wastes typically contain primarily urea with small amounts of ammonium and very little uric acid. Choices: - enzymes - hormones - lipids - proteins A:
proteins

Q: Q: What do tadpoles turn into? Read this paragraph and choose the correct option from the provided answers: Frogs develop from tadpoles, which develop from eggs. Notice the formation of the two powerful back legs used for jumping. Choices: - insects - fish - snakes - frogs A:
A: frogs

Question: Q: Named after the dutch physicist, the van de graaff is a type of what device used for nuclear research? Read this paragraph and choose the correct option from the provided answers: Early Accelerators An early accelerator is a relatively simple, large-scale version of the electron gun. The Van de Graaff (named after the Dutch physicist), which you have likely seen in physics demonstrations, is a small version of the ones used for nuclear research since their invention for that purpose in 1932. For more, see Figure 33.7. These machines are electrostatic, creating potentials as great as 50 MV, and are used to accelerate a variety of nuclei for a range of experiments. Energies produced by Van de Graaffs are insufficient to produce new particles, but they have been instrumental in exploring several aspects of the nucleus. Another, equally famous, early accelerator is the cyclotron, invented in 1930 by the American physicist, E. Lawrence (19011958). For a visual representation with more detail, see Figure 33.8. Cyclotrons use fixed-frequency alternating electric fields to accelerate particles. The particles spiral outward in a magnetic field, making increasingly larger radius orbits during acceleration. This clever arrangement allows the successive addition of electric potential energy and so greater particle energies are possible than in a Van de Graaff. Lawrence was involved in many early discoveries and in the promotion of physics programs in American. Choices: - radiation detector - electromagnetic - barometer - accelerator A:
Answer: accelerator

*Question*
Q: What type of compound is essential to life? Read this paragraph and choose the correct option from the provided answers: Water is essential to life because chemical reactions within cells take place in water. Most people can survive only a few days without consuming water to replace their water losses. How do you lose water?. Choices: - carbon - oxygen - nitrogen - water A:
**Answer**
water

Q: What temperature scale is obtained by adding 273 degrees from the corresponding celsius temperature? Read this paragraph and choose the correct option from the provided answers: The Celsius scale is the standard SI temperature scale. It is equal to the Kelvin scale if you minus 273 from the Celsius reading. Water has a boiling point of and a freezing point of . Choices: - whittle scale - seismic scale - ph scale - kelvin scale A:
kelvin scale