Why is embryonic stem cell research controversial? a. it requires the destruction of embryos to use the stem cells in research. b. it forces a mandate for all employees to submit to approval of stem cell research c. it reduces the overall potency of the cells. d. it causes birth defects in the embryos that have stem cells extracted.

Option A, It requires the destruction of embryos to use the stem cells in research.

Explanation:

In embryonic stem cell research, the stem cells are obtained from the blastula stage of embryo which causes its destruction. Embryo duting the blastula stage consists of two types of cells a) trophoblastic cell and b) inner cell mass. This inner cell mass contains the embryonic stem cell which is responsible for developing all the cells of the body and hence once this inner cell mass is destroyed no new cell is produced in the body and thus the embryo dies.

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg