Which is the most likely reason that stem cell research is controversial?
-stem cell research could lead to the development of human clones
-many people assume that all human stem cells come from embryos.
-research by using stem cells results in high-priced treatments for disease.
-information that is obtained from stem cell research is considered unreliable.

Which way do the nitrogenous bases in dna pair up? a. a and g; t and c b. a and c; t and g c. a and t; g and c d. a and a; t and t; g and g; c and c

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.

Milk production during breastfeeding is increased by the suckling of a newborn from his mother's nipple. this type of feedback mechanism best describes a positive or negative