хранителна верига

http://www.znam.bg/e-lessons/s1/runtime/rtleo/scorm-flo.html?sco=..%2F..%2Fcontent%2Fuc_s3_l055.flo&width=788&height=553&recording=true- ХРАНИТЕЛНИ ВЕРИГИ


http://www.znam.bg/e-lessons/s1/runtime/rtleo/scorm-flo.html?sco=..%2F..%2Fcontent%2Fuc_s3_l056.flo&width=788&height=553&recording=tru-
ХРАНИТЕЛНИ МРЕЖИ


http://www.znam.bg/e-lessons/s1/runtime/rtleo/scorm-flo.html?sco=..%2F..%2Fcontent%2Fuc_s3_l121.flo&width=788&height=553&recording=true- Движението на земятя