I need this one quick for a timed assignment:

How does dermal tissue help plants on a hot day?

A) It releases substances so plants can absorb more water from the soil.
B) It has a waxy material that prevents the loss of water to the environment.
C) It has guard cells that open to prevent the loss of water to the environment.
D) It contains chemical substances that allow plants to produce water.

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.

With regard to enzymes, key is to lock as a) substrate is to activation energy eliminate b) product is to substrate. c) enzyme is to active site. d) substrate is to active site.

Which of the following is an eon in the time scale? phanerozoic proterozoic archean all of the above