Flowers of orchid species Ophrys bombyliflora look and smell like female bumblebees. This attracts the male bumblebees flying nearby to the flowers. Thus, pollen sticks to the head and abdomen of the bumblebee, which causes pollination. This orchid species is only pollinated by these bees, which is why the species is known as bumblebee orchids. What mode of evolution is represented by this example? A. Coevolution
B. Punctuated equilibrium
C. Adaptive radiation

Assume that a student is given two different models of bacteria, with one model consisting of big bacteria and the other consisting of small bacteria. how can the student demonstate the theory of endosymbiosis using the models

Embryonic stem cells are cells derived from an embryo. these cells can be used to create new tissues for patients suffering from certain illnesses and disorders. which statement best summarizes why the use of embryonic stem cells could be seen as unethical? a. some people consider embryos to possess rights equal to those of fully developed human beings. b. extracting stem cells from embryos is a very energy-intensive process, which consumes resources that could be used elsewhere. c. embryos are difficult to obtain, so the monetary cost of using them for research outweighs their benefit. d. the process of extracting stem cells from embryos generates biohazardous waste that cannot be safely disposed of.

How secretion and excretion both are different? explain in simple language.