In the abc model of floral development, a, b, and c stand for the activities of different

The carbon cycle is best defined as a process in which a. carbon changes from inorganic forms to organic forms and back b. carbon is changed into other elements such as oxygen or nitrogen c. carbon is continually created from the sun’s energy by plants d. carbon is consumed and regenerated from other elements such as oxygen and nitrogen

Babies with very low or very high birth weight are less likely to survive. observe a graph of the data.

Why are current extinctions of concern to enviromentalists?