When hunting disrupts the balance in the food chain by removing all owls, there will be no predators on snakes, leading to their increase in numbers.  Considering the scenario where the number of lost owls (4) is replaced by snakes, compute for energy units following in completing the table below.  Trophic Levels No. Individuals in Each Trophic Level No. of Units Received from Trophic Level Above No. Units Used / Individual  (Resp) No. Units Used in Trophic Level No. Units Remaining & Passed on to Next Trophic Level Mean No. Units Available per Individual in Trophic Level SUN +E = 6             1) Plants 30   2       2) Grasshopper 19   2       3) Frog 12   2       4) Snake 8 + 4 = 12   2       5) Owl 0   2

The diagram below shows a typical NSW coastal food web. Sea Starfish urchins Algae on rocks Sea birds `Limpets. Crabs Mulberry whelks Periwinkle. Carnivorous fish Phytoplankton (microscopic plants) Zooplankton (microscopic animals Tubé worms Secondary Consumers Tertiary Consumers Рroducers Primary Consumers There has been an increase in the amount of larger sea urchins being removed from the area by people wanting them for food and bait. The smaller ones are harder to remove from the rock crevices where they attach and so they are not collected. (a) Outline the impact on the Mulberry Whelk population if people continue to remove the sea urchins. (b) With reference to the food web, explain how this human-induced selection pressure of collecting only the larger sea urchins could impact upon the biodiversity of this ecosystem over time. (c) Draw one food chain from this food web (d) Name an autotroph Name a herbivore Name a Carnivore Is there and Omnivore

http://www.fao.org/nr/water/aquastat/data/query/index.html?lang=en.  Step 1.  Choose five nations (including the United States) from the enormous database by clicking the corresponding boxes. For "select variables", choose these three: 1. Under "Water Resources" choose "Total Renewable Water Resources" and within that choose only "Total Renewable Water Resources per Capita. 2. Choose "Water Use" and then "Pressure on Water Resources" . Within that subset choose only"SDG 6.4.2 Water Stress". "SDG" means the Sustainable Development Goal. This value is the percentage of total available water that is used by a nation. 3. Under "Water Use" choose "Water Withdrawal by Sector", and within that choose only "Total Water Withdrawal per Capita".     Nation                     Resources per Capita   Withdrawal per Capita  % Water Stress: withdrawal vs. resources)                                                       Step 2.    Based…

If 1,000 Joules of energy are present in the primary consumer trophic level of a community, approximately how many Joules might be expected to be present in the primary producer trophic level? Group of answer choices Which of these answers is most likely depends on the particular community 10,000 Joules 100 Joules 1000 Joules