In a spontaneous reaction - a. the reaction happens very quickly. b. additional heat is required to make it occur. c. no additional heat is required to make it occur. d. additional heat is absorbed from the environment.

Which of these statements best describes the st. lawrence seaway? the st. lawrence seaway connects the st. lawrence river with the arctic ocean. the st. lawrence seaway provides an important trading route between the u.s. and mexico. the st. lawrence seaway provides an important trading route for the u.s, but has little value for canada. the st. lawrence seaway connects the great lakes, the st. lawrence river, and the atlantic ocean.

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

The cluster of developing cells from conception until birth is called an