Which organelle can be compared to a security guard who decides whom may enter a building and whom may not?

O cell membrane

O cytoplasm

O endoplasmic reticulum

O mitochondrion

The population in the United States in 2000 was about 281 million people. In 2015, it was 321 million people. From 2000 to 2015, the population increased___ %.

Would ringworld have a normal atmosphere?

Sedimentary rock is usually a. light colored and high density c. dark colored and high density b. light colored and low density d. dark colored and low density

In which phase (s) of matter are the atoms closely packed but still able to slide past each other? gas liquid solid and gas liquid and solid

Which of the following is a measure of the biodiversity of an ecosystem? A) The total number of individuals of a single animal species B) The density of individuals in a hectare C) The total number of different plant species D) The soil depth at

A repeated or prolonged exposure that may bring it about slowly develop symptoms

Meiosis produces NONidentical cells. Mitosis also produces NONidentical cells. true or false?

What is the nickname for Primase and what is functions and purpose?

Why did Thomas Morgan use fruit flies in his study's

What factors contribute to biodiversity