(2) The food chain is a relationship between producers and consumers. From the producer to the consumer, there is an arrow in the middle, and the direction of the arrow points to the consumer. Cicada sucks sap from trees, mantis feeds on cicadas, and yellowbird feeds on mantis. So the food chain is: tree (or plant) → cicada → mantis → yellowbird. If yellowbirds are killed in large numbers, mantis will increase due to the decrease of natural enemies.
(3) Weasels and chickens, weasels eat chickens, and weasels steal chickens to survive, so there is a predatory relationship between weasels and chickens. Therefore, "the weasel pays New Year greetings to chickens-unkind." Weasels are unkind because weasels and chickens are carnivores.
(4) Things are different: mulberry fields: farmland. The sea becomes a mulberry field, and the mulberry field becomes the sea. For example, the world has changed a lot. So "things are human beings" refers to the mutual transformation between marine ecosystem and farmland ecosystem, and its implication is that things have changed a lot.
(5) Various factors that affect biological life in the environment are called environmental factors, which are divided into abiotic factors and biological factors. Abiotic factors include light, temperature, water, air and soil. Biological factors refer to all other organisms in the environment that affect an individual's life, including the same species and different species. "Good weather and abundant crops" emphasizes that water is an important abiotic factor affecting crop growth.
So the answer is:
(1) inheritance
(? 2) Reduce
(3) predation?
(4) Ocean
(5) Moisture (water and rain are also given points)