1. Sexual reproduction is important to evolution because sexual reproduction
(1) occurs only in more recently evolved forms of animal life.
(2) decreases the chances for survival of the species.
(3) increases the chances for variations.
(4) is the more usual kind of reproduction.

About how much of the cell mass is watet

Which of th following best describes how genes produce traits in an organism?

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.