Abiology teacher asks his class to make models of a plant cell, an animal cell, and a bacterial cell. aside from cytoplasm and the cell membrane, which other cell structure will the students need to make for all three models? a)ribosome b) nucleus c) golgi apparatus d) chloroplast e) cell wall

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.