Sexual reproduction is the reproductive process that 1) keeps species from changing. 2) produces identical offspring. 3) causes mutations. 4) creates genetic variety.

What type of appendages do sponges cnidarians roundworms annelids mollusks arthropods echinoderms and vertebrate have? jointed, not jointed, absent  

Consider the equation s + o2 ? so2. what is the product? question 3 options: s so 2 s + so 2 o 2

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.