INVOICES INVOICE_NUM INVOICE_DATE CUST_ID 14216 11/15/2021 125 14219 11/15/2021 227 14222 11/16/2021 294 14224 11/16/2021 182 14228 11/18/2021 435 14231 11/18/2021 125 14233 11/18/2021 435 14237 11/19/2021 616 INVOICE_LINE INVOICE_NUM ITEM_ID QUANTITY QUOTED_PRICE 14216 CA75 3 $37.99 14219 AD72 2 $79.99 14219 DT12 4 $39.99 14222 LD14 1 $47.99 14224 KH81 4 $18.99 14228 FS42 1 $124.99 14228 PF19 1 $74.99 14231 UF39 2 $189.99 14233 KH81 1 $19.99 14233 QB92 4 $109.95 14233 WB49 4 $74.95 14237 LP73 3 $54.95 ITEM ITEM_ID DESCRIPTION ON_HAND CATEGORY LOCATION PRICE AD72 Dog Feeding Station 12 DOG B $79.99 BC33 Feathers Bird Cage (12x24x18) 10 BRD B $79.99 CA75 Enclosed Cat Litter Station 15 CAT C $39.99 DT12 Dog Toy Gift Set 27 DOG B $39.99 FM23 Fly Mask with Ears 41 HOR C $24.95 FS39 Folding Saddle Stand 12 HOR C $39.99 FS42 Aquarium (55 Gallon) 5 FSH A $124.99 KH81 Wild Bird Food (25 lb) 24 BRD C $19.99 LD14 Locking Small Dog Door 14 DOG A $49.99 LP73 Large Pet Carrier 23 DOG B $59.99 PF19 Pump & Filter Kit 5 FSH A $74.99 QB92 Quilted Stable Blanket 32 HOR C $119.99 SP91 Small Pet Carrier 18 CAT B $39.99 UF39 Underground Fence System 7 DOG A $199.99 WB49 Insulated Water Bucket 34 HOR C $79.99
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the cytoplasm (cyclosis), and the formation of another vacuole begins. Food vacuoles travel in a defined route through the organism (Fig. 16-3). They first pass posteriorly, then anteriorly, and finally posteriorly to the region of the oral groove where the undigestible contents are eliminated through the cytopyge (anal pore). Locate a food vacuole. Observe that when it is first formed, the vacuole is bright red-orange. Closely observe the vacuole as it moves through the protozoan. You will see that during digestion, its contents change from red-orange to blue-green to yellow-green to yellow and finally back to red-orange (Fig. 16-3). The reason for this color change is that Congo red is an indicator dye that changes color with pH: it is blue-green in acidic conditions and red-orange in alkaline conditions. What does this indicate about the pH of the food vacuole as it moves through the organism? The most common type of reproduction in protozoa is binary fission. In this type of asexual reproduction, the cell divides into two genetically identical daughter cells. In flagellates, the plane of division is longitudinal; in ciliates, the parent cell divides transversely. Examine demonstration slides of Paramecium showing the various stages of binary fission (Fig. 16-4). Occasionally, paramecia reproduce sexually by conjugation (Fig. 16-5), in which micronuclei are exchanged. You can observe conjugation in Paramecium by carrying out the following procedure. For this study, you will use mating strains of Paramecium bursaria, which is symbiotic with a green alga. Supplement your observations by examining commercially prepared slides showing various stages of conjugation. Put a small drop of one of the two mating strains into the depression of a deep-well slide. While observing the paramecia with a stereoscopic microscope, add a drop of the second mating strain. You should observe, almost immediately, the agglutination (or clumping) of opposite mating strains, which brings the cells together for the transfer of nuclear material. Place the slide in a covered petri dish containing moist filter paper to prevent dessication of the culture. Examine periodically. Conjugating paramecia can be seen for up to 48 hours, after which few or no conjugants are found.
Courtney T.
Problem statement: The Lotka-Volterra equations are used to model competition and predation. You may use web resources for some questions. For two competing species, use what you know about Lotka-Volterra to make a sketch and describe the outcomes for each of the following scenarios: 1. What would be the ultimate outcome for both competitors under the following set of conditions? (15 points total) - K = 200, r = 100, alpha = 12 - K = 100, r = 10, alpha = 20 - K = 160, r = 20, alpha = 2 Remember, your book uses alpha (α) instead of r. It's just a matter of saying the same thing. Lotka-Volterra equations consider the following assumptions: - The population size of Species A has been approximately 100 individuals per km² - The population size of Species B has been approximately 50 individuals per km² - Species A has experienced a sudden increase in population size due to the decline of Species B. Answer the following questions based on the information provided. You'll need your critical thinking skills! 16. Now imagine a case where the values above are the carrying capacities of the populations. Do not simply assume that the populations are stable. Use this information to determine the competition coefficients (alpha and beta). Sketch the phase diagram that describes this new scenario. Which species should win? (10 points) 17. BONUS points: What would the population sizes of each species be in the absence of their competitors? In other words, if a female individual of Species A had no competitors, how many individuals of Species A could exist? Likewise, if a male individual of Species B had no competitors, how many individuals of Species B could exist? (Hint: It might be helpful to first consider the effect of removing a single individual) 18. Explain how the figures below relate to each other in terms of predator-prey relationships. Label the axes and put missing directional arrows. (5 points)
Adi S.
Analyzing Data 13.1: Will a Defensive Symbiont Increase in Frequency in a Host Population Subjected to Parasitism? https://ecology4e.sinauer.com/protected/ad13.html Complete this exercise on the textbook's website, then answer these questions. Suppose a group of researchers conducted a set of experiments to investigate whether species of defensive bacterial symbionts can protect fruit flies from the nematode parasite Howardula. In this research, they wanted to determine if a certain species of defensive bacterial symbionts could benefit the fruit flies. They first established a large population of fruit flies and exposed the population to the nematode parasite. They then separated the fruit fly individuals into two groups: those without Howardula (the parasite) and those with Howardula. They screened individuals from both groups for seven species of symbionts (A-G). Table 1. Percentage of Fruit Fly Individuals with Different Species of Symbionts. Question 3. In Table 1, how many symbiont species had no effect on the number of fruit flies parasitized by Howardula? Question 4. How did you reach your conclusion in Question 3? Question 5. In Table 1, is there any evidence of symbiont species that have been negatively affected by parasitism?
Madhur L.
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