While observing skeletal muscle tissue under the microscope you note that it appears striated. You tell your lab partner this is because .

Rachel ate a piece of fruit and happened to drop the seeds in her backyard. after a few weeks, she saw a small plant with flowers growing in the backyard. which group does this plant belong to? a. angiosperms b. gymnosperms c. pteridophytes d. bryophytes e. chytrids

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?