One effect of the pesticide ddt upon birds is to inhibit the production of the enzyme carbonic anhydrase, which controls calcium metabolism. it is believed that this causes eggshells to be thinner and weaker than normal and makes the eggs more prone to breakage. an experiment was conducted where 16 sparrow hawks were fed a mixture of 3 ppm dieldrin and 15 ppm ddt (a combination often found in contaminated prey). the first egg laid by each bird was measured, and the mean shell thickness was found to be 0.19 mm. a "normal" eggshell has a mean thickness of 0.2 mm. the null and alternative hypotheses are

Why is the theory of evolution important? it disproves all other theories about how life began. it provides a topic for debate. it is a unifying concept in biology. it explains how life began. i know for sure, it is not "it is a unifying concept in biology."

In which layer do organisms on earth love?

Me brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula.5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects.8. describe the planets’ orbits around the sun.9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets.13. what causes the seasons?