Answer:
Soil
Explanation:
Ecological succession, which refers to the series of changes that occurs in an ecosystem over time, is of two types viz: primary succession and secondary succession. In primary succession, a new or barren area (usually a rocky surface) is colonized by organisms such as lichens called PIONEER SPECIES.
However, in secondary succession, an ecological disturbance such as natural disasters disrupt the ecosystem causing the area, which was made void, to be recolonized by organisms. Note that, despite the disturbances, a key factor which is SOIL is still present in the environment to sustain the growth of the recolonizing organisms in secondary succession
Answer:
A
Explanation:
Genetic variation means difference in organisms. If they are identical, they are not different, and therefore there is no variation.
Irrigation causes an increase in salt which will kill plants. Pesticides poison water making it undrinkable. Pesticides can contaminate the soil for long periods of time.
Answer:
C (Ribosomes)
Explanation:
Ideally, protein synthesis is a process that occurs in living cells involving the transcription of DNA into mRNA molecule and a subsequent translation of the mRNA into amino acids, which encodes proteins.
However, in vitro (test tube) production of proteins can be done outside living cells, which means that the site of protein synthesis in living cells called RIBOSOME is not needed for the in vitro procedure.
The instructions for making all the different types of cells in a human are encoded in the DNA of every cell.
a) true