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A livestock procedure begins with fertilization, followed by divisions and separation of the cells shown. What is structure X before separation? A. A cluster of unfertilized eggs B. An early embryo C. One ovarian follicle D. A cluster of independently…
Water fleas feed on algae, small fish eat water fleas, and herons eat the fish. Which energy pyramid has the correct trophic order and relative energy availability? A. Pyramid A B. Pyramid B C. Pyramid C D. Pyramid D
Which processes can transfer carbon along X and Y? A. X: photosynthesis; Y: burial B. X: respiration; Y: combustion C. X: feeding; Y: photosynthesis D. X: fossil formation; Y: nitrogen fixation
The table gives rounded values for a constructed atmosphere scenario. Which gas makes the largest modelled contribution to warming? Gas | Concentration / ppm | Approximate persistence / years | Modelled warming contribution / relative units Carbon dioxide |…
Which change can occur as the climate warms? A. Every ocean current must retain exactly its former pattern B. Seawater necessarily becomes more alkaline because it is warmer C. Circulation changes can alter ocean nutrient upwelling D. All tropical storms must…
Which forms of energy enter the producer at X and pass to the primary consumer at Y? A. X: thermal; Y: nuclear B. X: chemical; Y: light C. X: light; Y: chemical D. X: kinetic; Y: thermal
Which observations can support evolutionary change? I. Heritable changes achieved by selecting crop varieties. II. Successive fossil assemblages with differing organisms. III. Similar underlying limb structures in different vertebrates. A. I only B. II and III…
Which set contains an ancestor and all of its descendants on this rooted tree? A. A and C, with their common ancestor B. B and D, with their common ancestor C. A and B, with their common ancestor D. C and D, with their common ancestor
Which explanation is consistent with the trend in this constructed bacterial dataset? A. The antibiotic gives every bacterium an inherited need to resist it B. Resistance means that bacteria have human-like acquired immunity C. Resistant variants can survive…
Five species have the character states below. Assume each derived character arose once without subsequent loss. Which cladogram fits these data? Species | Trait 1 | Trait 2 | Trait 3 | Trait 4 | Trait 5 U | absent | absent | absent | absent | absent V |…