#Question id: 28463
#Unit 5. Developmental Biology
First inducers of the lens are foregut endoderm and cardiac mesoderm, Foregut endoderm and cardiac mesoderm cause the synthesis of the factor in the head ectoderm during the late gastrula stage, these type of factor are____
#Question id: 2346
#Unit 2. Cellular Organization
The removal of waste products from the amoeba is an example of
#Question id: 11092
#Unit 7. System Physiology – Animal
Which statement is the most accurate definition of external respiration?
#Question id: 26971
#Unit 10. Ecological Principles
#Question id: 12761
#Unit 10. Ecological Principles
Refer to the following experiment, which is designed to test the co evolutionary relationships among an unpalatable butterfly (the monarch), a palatable butterfly (the viceroy), and a butterfly predator (the jay). Monarch butterflies are reared on three diets: milkweed (their natural food), cabbage, and cabbage treated with an extract from milkweed leaves. Viceroy butterflies, mimics of monarchs, also are reared on three diets: willows (their natural food), cabbage, and cabbage treated with an extract from milkweed leaves. In trial 1 of the first experiment, adult butterflies reared on a particular diet are presented one at a time at 1-hour intervals to jays and the jays are allowed to feed. Each jay is fed until it refuses to eat the butterfly presented, but no more than 12 butterflies are presented to a jay during a particular test. Five birds are used for each test; therefore, up to 60 butterflies can be consumed for each diet test. The observer records the actual number of butterflies eaten. In trial 2, the experiment is repeated 2 weeks later. In the second experiment, the butterflies are reared on the same diets as in experiment 1. However, when they are offered to jays, some jays receive a monarch reared on milkweed before being offered the butterflies reared on the experimental diets; the other group of jays is first given a viceroy reared on willow before being offered the butterflies reared on the experimental diets. The initial butterfly offered is included in the total number eaten, but no more than 12 butterflies are presented to each jay.
In the experiment, which data in the table most strongly indicate that viceroys are not obtaining compounds that will make them unpalatable?