Menutupnya daun pada malam hari, merupakan gerak
a. seismonasti c. termonasti
b. niktinasti d. fotonasti
Contoh gerak higroskopis adalah
a. pecahnya buah polongan
b. mekarnya bunga pukul empat
c. gerakan sulur pohon labu
d. menutupnya daun putri malu pada sore hari

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.

What class of levers is shown in this image?

If you relate the doppler effect on sound to the color of light waves, a police car would be the color as it approaches and the color as it recedes away from the observer.