Scientist believe that the first life form appeared over how many years ago

Which of the following are biotic factors in an ecosystem? a. Rain sunlight plants. n. plants animal bacteria. c. temperature animals plants. d. animals minerals in the soil, rain

The displacement of two bones in which the articular surfaces partially lose contact with each other is called a. subluxation. b. dislocation. c. sublimation. d. subjugation

To be activated CPR must first bind? a. the co-repressor molecule b. the repressor molecule c. the repressor protein d. cAMP e. the activator protein

Malnutrition is caused by the lack of of specific? A. protein B. mineral C. carbohydrate D. nutrient

What are the three main categories of organelles within the cytoplasm?

What would the temperature of the surface be if the Earth did not have an atmosphere?

How would the lack of water affect cellular respiration?

Different types of normal tissues in the human body have different mitotic indices. From the following list, which normal tissues would you expect to have the highest mitotic index: muscle, skin, kidney, or lung? Explain your answer.

A group of scientists decided to post their research results on the Internet instead of publishing in a scientific journal. What part of the scientific process have they skipped and why does it matter?

How does the structure of DNA allow it to complete the process of replication?