Carbon dioxide in the atmosphere traps heat. scientists are concerned that too much carbon dioxide is being released into the air by human activity. using your knowledge of the carbon cycle, where do you think this carbon dioxide is coming from? List at least three possible sources of human-related carbon dioxide production

The illustration shown is an ovum, a female sex cell. a mutation in this cell may be passed to the woman’s offspring during a) birth. b) mitosis. c) dna replication. d) sexual reproduction

Using meiosis, the sporophyte produces spores that are .

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.