The international date line is found at which degree longitude? 0° 180° 75° 50°

Name the plastid and pigment likely to be found in the cells of (a) petals of sunflower (b) ripe tomato.

Which description provides the best objective summary of the article in the passage?

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes