The fossil of a plant reveals that it produced spores that were used for reproduction. which type of plant was it? seed seedless monocot dicot

Ashort, vertical, solid, or fleshy stem possessed by gladiolus and which is used in reproduction is termed a

Read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. applying the biological species concept, the sterility of ligers reveals that a. lions are probably a subspecies of tigers b. tigers and lions are the same species c. a new species called "ligers" is forming d. tigers and lions are separate species

The response is the basis for vaccination. primary secondary tertiary none of the above