(These are the ones with 2 pills, taken a couple of days apart.) They can be carried out up t â¦ o 12 weeks of pregnancy.   After 12 weeks of pregnancy there are 2 options, one is to have labour induced (You are given a drug which makes the uterus contract) and the other is a surgical abortion.(Removing the contents of the uterus, usually with a vacuum pump.).1 person found this useful. After 12 weeks of pregnancy there are 2 options, one is to have labour induced (You are given a drug which makes the uterus contract) and the other is a surgical abortion. (Removing the contents of the uterus, usually with a vacuum pump.). 1 person found this useful.
keystone species. A keystone species is an organism that helps define an entire ecosystem. By keeping populations of mussels and barnacles in check, this sea star helps ensure healthy populations of seaweeds and the communities that feed on themâsea urchins, sea snails, limpets, and bivalves.
The role that a keystone species plays in its ecosystem is analogous to the role of a keystone in an arch. While the keystone is under the least pressure of any of the stones in an arch, the arch still collapses without it.he role that a keystone species plays in its ecosystem is analogous to the role of a keystone in an arch. While the keystone is under the least pressure of any of the stones in an arch, the arch still collapses without it.