What two layers of the egg must the sperm penetrate to reach the egg's plasma membrane?

A paleontologist has discovered a fossil of a jawbone from a prehistoric carnivore. It is similar to other fossils found in nearby areas, but has some unique characteristics and was found in a much deeper rock layer.

Natural gas forms from the remains of buried plants and animals. a. True b. False

Describe how scientists choose the kingdom in which a eukaryotic belongs

Tubers and rhizomes are part of the root system. true or false.

A branch of a cladogram that consists of a single common ancestor and all the descendants of that ancestor is called: A. cladistics B. A clade C. a class D. a kingdom

Which of the following examples illustrates a pivot joint in use? A. you wind up to pitch a baseball B. you wave good bye to your friend C. you kick a football D. you look behind you

Bacterial cells have a much higher rate of metabolism than animal cells. Under ideal conditions some bacteria double in size and divide every 20 min, whereas most animal cells under rapid growth conditions require 24 hours.

What term includes all the biotic and abiotic elements in an area?

Best way to avoid infections and keep your immune system healthy

Certain fossils, such as Trilobites found after the Cambrian explosion, are found in the same geologic time period all over the world. What is the importance of fossils that are consistently found in the same geologic time period?