How does sonar technology measure the depth of the ocean floor? A
The device sends sound signals to the ocean floor and records the time it takes for each signal to return.

B
The device receives electromagnetic energy that is emitted by cooling oceanic crust.

C
The device lowers a cord from a ship to the bottom of the ocean and records the cord's length.

This organism is not capable of performing photosynthesis. (horseshoe crab) true false

Which of these is true of the cytoplasm of an unfertilized egg? a. it is an unevenly distributed mixture of mrna, proteins, organelles, and other substances. b. it does not contain substances that are important in directing development. c. these substances are supplied by the sperm. d. it does not contain substances that are important in directing development. e. development is directed solely by the surrounding cells. f. it is a homogeneous mixture of mrna, proteins, organelles, and other substances. g. it does not contain substances that are important in directing development. h. these substances are produced by the dna of the fertilized zygote.

The source of energy shown in the image is (renewable, non renewable, polluting) a drawback of building a dam is that (it will destroy ecosystems, it requires fossil fuels, it won’t be useful for irrigation)