A 500-hz whistle is moved toward a listener at a speed of 10. 0 m/s. At the same time, the listener moves at a speed of 20. 0 m/s in a direction toward the whistle. What is the apparent frequency heard by the listener? (the speed of sound is 340 m/s. ).

Given: m∠apc = 27°, m dc = 27° find: m ab

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.

Scientists observed a rock stratum with fossil. if mollusks evolved before arthropod, where will their fossils be found.