Cho phương trình: x1 + x2 + x3 + x4 + x5 = 2021 (*) a. Tìm số nghiệm nguyên không âm của phương trình (*)

b. Tìm số nghiệm nguyên không âm của phương trình (*) thỏa: x2 ≤10, x2 ≤12 và x3≥12​

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Tortoise shells and snail shells are similar in function: they protect the organism from predators. based on a comparison of the organisms in the images, what can you conclude? 1. tortoises and snails have homologous organs, and they’re evolutionarily related. 2. tortoises and snails have homologous organs, and they belong to same species. 3. tortoises and snails have analogous organs, and they belong to the same species. 4. tortoises and snails have analogous organs, and they don’t belong to the same species. 5. tortoises and snails have analogous organs, and they aren’t evolutionarily related.