2. biological environment consisting of all the organisms living in a particular area, as well as all the nonliving, physical components of the environment with which the organisms interact, such as air, soil, water and sunlight.

3. ecologically and geographically defined area that is smaller than an ecozone and larger than an ecosystem.
Ecoregions are large areas of land or water, and contain unique groups of natural communities and species

5. Cottonwood
Mesquite
Cedar
Acacia
Prickly pear cactus
Mule deer
Swift fox
Prairie dog
Hawk
Burrowing owl
Pronghorn Antelope
Hognose snake
Badger

6. Pecan
Post oak
Buckeye
Elderberry
Sycamore
Beaver
Raccoon
Bobwhite quail
Scissortail flycatcher
Black-capped vireo
Golden-cheeked warbler
Armadillo
Whitetail deer
Mexican free-tailed bat
Ornate box turtle

7. Plants and animals of the Pineywoods:
Oak
Maple
Dogwood
Cypress
Whitetail deer
Bull frog
Bobcat
Striped skunk
River otter
Short tailed shrew
Woodpecker
Bald eagle

8. Plants and animals of Big Bend Country:
Prickly pear cactus
Yucca
Mexican pinyon pine
Diamondback rattlesnake
Tarantula
Pronghorn antelope
Coyote
Mountain lion
Horned lizard
Great horned owl
Peregrine falcon
Javelina
Roadrunner

9. Oak
Juniper
Mesquite
Indigenous grasses (bluestem, indiangrass, buffalograss…)
Salamander
Cricket frog
Armadillo
Grebes
Raccoon
Green-backed heron
Ringtail

10. Silverleaf sunflower
Yaupon holly
Duckweed
Cattail
Swallowtail butterfly
Red-winged blackbird
Crested caracara
Indigo snake
Texas tortoise

11. Sweetgum
Wax myrtle
Muskrat
Alligator
Bottlenose dolphin
Whooping crane
Pelican
Blue crab
Shrimp
Roseate spoonbill

12. degree of variation of life forms within a given ecosystem, or an entire planet!

13. What is a food chain?
A food chain shows how each living thing gets food, and how nutrients and energy are passed from organism to organism.
Grass Caterpillar Bird

14. What is a food web?
Food webs show how different organisms are interconnected by different paths.
Food webs are made up of food chains: