The Proterozoic era is defined by the following events: eukaryotic cells first seen stable continents first bacteria fossils the Cambrian explosion oxygen building up in atmosphere

Which of the following is most likely to be propagated by grafting? A An apple tree B An iris C A strawberry plant D a fern

How is xylem modified to carry out its functions

What is most likely found in structure x

Which are the most radiosensitive cells? a. muscle cells b. nerve cells c. blood cells d. bone cells

One molecule of glucose makes 30 molecules of ATP. How many molecules of glucose are needed to make 600 molecules of ATP in aerobic respiration? A. 360 B. 20 C. 10 D. 2736

What did George Buffon contribute to evolution

During this phase, chromosomes coil tightly, the nuclear membrane begins to breakdown, and the spindles begin to form. A. anaphase B. telophase C. prophase D. metaphase

According to freud, the part of the mind that is an impulsive mechanism is the:

Which of the following pairs are the best examples of homologous structures? A) bat wing and human hand B) owl wing and hornet wing C) porcupine quill and cactus spine D) bat forelimb and bird wing E) Australian mole and North American mole

Which layer of the atmosphere protects earth from meteoroids