Ans: Cancer is the result of unchecked cell division caused by a breakdown of the mechanisms regulating the cell cycle. The loss of control begins with a change in the DNA sequence of a gene that codes for one of the regulatory molecules.
The false statement is: Growth hormone is produced by the posterior pituitary
Growth hormone (GH) or somatotropin is produced in the cells called somatotrophs of the anterior pituitary gland. GH is a peptide hormone that stimulates growth, cell reproduction, and cell regeneration. Its function is involved in metabolic processes (favors anabolism or synthesis of macromolecules). Also, growth hormone stimulates production of IGF-1 and increases the levels of glucose and free fatty acids.
It would be the second option
A change in an ecosystem necessarily affects the species which are part of it, and changes in species in turn affect ecosystem processes. ... This is caused by the extinction of species or loss of populations that had been unique to particular regions and by the invasion or introduction of species into new areas.
Decomposers and scavengers break down dead plants and animals. They also break down the waste (poop) of other organisms. Decomposers are very important for any ecosystem. If they weren't in the ecosystem, the plants would not get essential nutrients, and dead matter and waste would pile up.
