What are the loosely packed photosynthetic cells in the leaf called? A. epidermis B. guard cells C. spongy mesophyll D. palisade mesophyll

Something that causes a population to decrease

A frameshift mutation could result fromA) a base insertion only. B) a base deletion only. C) a base substitution only. D) deletion of three consecutive bases. E) either an insertion or a deletion of a base.

What is common between the environmental changes of ice ages and global warming? A. They influence global temperatures in the same way. B. They have the same causes. C. They can lead to extinction. D. They disrupt the same species in the same ways.

A means of expressing numbers as a multiple of two factors: a number between 1 and 10; and ten raised to a power, or exponent

Which statement could be a possible explanation for the drop in mercury concentration in the fish of Onondaga Lake between the years 2002 and 2003? (1) Between 2000 and 2005, a large number of fish were sampled.

Which of the following statements is true of an object composed of a single cell? It could be considered living only if it has some of the other characteristics of life. It is a living thing. It is not a living thing. It could become a living thing.

If night blindness is a recessive trait, what should the phenotype of the couple's fourth child be?

What's the jet stream and why is it important

a person who is more than 2o percent heavier than the average person of the same sex and height is said to be

How do nanoparticles of air pollution get into the brain?