Which of the following is true of red blood cells? a. they have multiple nuclei b. once created in bone marrow, they circulate for our lifetime c. they live for only 120 days d. they live for only about 20 days

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.

What do scientists need to look at before developing an argument

Development of new communities in disturbed environments, such as a burned or a clear cut forest, is called