Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
23 Cards in this Set
- Front
- Back
|
Developed countries have what % of the population?
|
20
|
|
|
Developed countries have what % of the world's wealth?
|
85
|
|
|
Developed use what percent of natural resources?
|
90
|
|
|
developed generate what percent of pollution and wastes?
|
75
|
|
|
developed countries generate what percent of the toxic wastes?
|
90
|
|
|
The US has about what percent of the world's population?
|
4.5
|
|
|
The US uses about what percent of the world's mineral and renewable resources?
|
25
|
|
|
of the desperately poor earning less than $1 a day, what ratio live in rural areas
|
2/3
|
|
|
what industry is responsible for 2/3 of world's annual freshwater use?
|
agriculture industry
|
|
|
what animal has no tissues, organs or symmetry?
|
Sponges
|
|
|
how many known species of animals are there?
|
2,000,000
|
|
|
first animals with organs?
|
flatworms
|
|
|
first animals with tissues?
|
cnidarians
|
|
|
most abundant on earth?
|
Roundworms
|
|
|
first animals with complete digestive system?
|
roundworms
|
|
|
are there more species of insects or roundworms?
|
insects
|
|
|
what is elephantiasis caused by?
|
plugged lymph nodes by roundworms
|
|
|
first animals with a body cavity (coelem)
|
mollusks
|
|
|
what is an annelid example?
|
earthworm (ringed)
|
|
|
what animals accounts for over half of the world's animal species?
|
arthropods
|
|
|
what are the 3 groups of arthropods?
|
insects, spiders and crustaceans
|
|
|
what were first vertebrates on land?
|
amphibians
|
|
|
are most chordates vertebrates or invertebrates?
|
vertebrates
|
