6.

(a) Which mixture(s) at home can be separated by the separation technique?
A. Tea brewed with fresh Chinese tea leaves
B. Homemade barley drink with barley seeds
C. Fruit pulps in fruit juice
D. All of the above

The development of_ factored in the development of complex organisms.

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

What can be said about farmers in highly developed countries? a) they have little or no negative impact on the environment. b) they practice subsistence agriculture. c) they are able to incorporate polyculture into their farming practices. d) they utilize organic farming techniques on a regular basis. e) they rely on large amounts of energy from fossil fuels.