A wide variety of organisms are classified as vertebrates, including mammals, birds, fish, amphibians, and reptiles. Vertebrates share many physical characteristics.
Which of the following is true about vertebrates?
OA.
Most vertebrates are born cold blooded then later become warm-blooded.
OB. Vertebrates are neither warm-blooded nor cold blooded.
C. Some vertebrates are warm-blooded while others are cold blooded.
OD. Most vertebrates are born warm-blooded then later become cold blooded.

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.