The movement of a bird away from a grass fire is caused by

A) receptors initiating a stimulus

B) impulse forming in a muscle tissue

C) muscles responding to a stimulus

D) effectors synthesizing neurotransmitters

The Earth is populated mostly by single-celled organisms, such as bacteria. However, there are many multi-celled organisms as well. Which of the following is a multi-celled organism? A. flower B. human C. insect D. all of these

An organ is a structure that consists of two or more types of tissues that work together to do the same job. True False

Semiconservative replication involves a template. what is the template?

Which statement best describes the action that is creating the Rift Valley in Africa? The African plate is splitting apart to form two separate plates. The Eurasian plate is converging with the African plate.

The element nitrogen has the atomic number 7 and an atomic mass of 14. How many neutrons does an atom of nitrogen contain? A. 14 B. 7 C. 0

Which statement best describes the relationship between activation energy and rate of reaction? O Increasing the activation energy can increase the rate of a reaction. O Reducing the activation energy can increase the rate of a reaction.

Definition: this is a haploid cell with half the reproductive information from the parent.

Does a cell use energy when molecules diffuse in or out of the cell? Why?

Below is a list of possible challenges. Check all errors that you mentioned in your answer. Traits other than beak type might affect natural selection. It could take many generations to observe adaptions to a population.

A farmer dug a well but did not find any water Which reasons most likely explain why the farmer did not find water? Check all that apply.