(20 14? Fuzhou) Fuzhou has good conditions for the growth and reproduction of goldfish. There are many kinds of goldfish in Fuzhou, with different postures, which are world-renowned.

(1) Various factors affecting biological life in the environment are called environmental factors, which can be divided into abiotic factors and biological factors. Abiotic factors include light, temperature, water, air, soil, etc. Fish live in water, breathe with their gills and swim with their fins, so they must live in water, without which they will die. As the saying goes, "Fish cannot live without water".

(2) Most fish live in water, and their bodies are covered with scales. They swim by breathing through gills, swinging their tails and trunks and coordinating their fins. The energy needed for swimming is mainly released by decomposing the organic matter in the mitochondria of cells.

(3) The different manifestations of the same trait of the same organism are called relative traits in genetics. Some characters of an object are controlled by a pair of genes, and the paired genes are often divided into dominant genes and recessive genes. When the two genes controlling biological traits are both dominant genes, dominant traits are displayed; When one of the genes controlling biological traits is dominant and the other is recessive, it is a dominant trait controlled by dominant genes; When a pair of genes controlling biological traits are recessive genes, they are recessive traits. Suppose that one caudal fin is controlled by dominant gene B and two caudal fins are controlled by recessive gene B, then the genomes of both caudal fins become BB.

(4) The connotation of biodiversity usually includes three aspects, namely, the diversity of biological species, the diversity of genes and the diversity of ecosystems.

So the answer is: (1) water; (2) fin; Mitochondria; (3) relative; bb； (4) type.