Answer:
Option A, Key stone
Explanation:
A keystone species plays a major role in an ecosystem as it is the species whose presence effects all other species in the ecosystem .In general a keystone species is always a dominant predator that feed on prey population. If it is removed, the prey population will explode and the population diversity will reduce. For example - bison, prairie dog etc.
Hence, option A is correct
Social convoy
Social convoy refers to a group
of people who accompanies an individual on the journey of life. A social convoy
provides personal, familial, cultural, and even professional supports for an
individual. Family members usually comprise a part of social convoy and its
makeup changes over time.
Biologists and farmers alike are concerned that a cloned flock would result in harmful genetic mutations in future generations and possibly lead to dangerous food products.
Answer:
Vitamin B12 can be made from genetically modified bacteria
