Louisa put a bowl of water and a bowl of sand in the sun. she put a thermometer in each bowl. then she recorded the temperature at the start and after 30 minutes. after 30 minutes, the sand had heated more than the water.

louisa’s experiment proved that

a. sunlight does pass through water.
b. sunlight heats liquids more than solids.
c. different materials heat up at different rates.
d. different materials absorb the same amount of heat.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.

i don't know. if i were you, i would search it up online : d

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )