D. A keystone species existence keeps an ecosystem in balance.
Answer: A would be behavioral
B would be functional
C would be functional
Answer: Humans are dependent on animal and plant based products for survival.
Explanation:
a. Pizza: My meal is pizza which contains the plant and animal based foods. Plant foods include vegetables like tomato, capsicum, corn, and onion. The two animal based foods used in this will be chicken meat and swine meat. The pizza dough requires yeast to attain a desire puff, yeast here is a fungal strain. The resources required for preparation of pizza are easily available as they are replenishable renewable natural resources. These are available in farm, food market, and butcher shops easily. The plant based foods will grow with the help of seeds and animal based food will be available by breeding in farms.
b. The forest reserves are rich source of renewable natural resources like wood, plant based food, medicines, and other products. If forest reserves are not replenished then the need of these products will increase due to scarcity.
c. Plant: Clothes, furniture, medicines, food, and others.
Animal: Clothes (jute, silk), tools from animal horns, decorative item from elephant ivory
