What is the large structure that directs the cell's activity

The harp seal lives on the polar ice sheets. Which adaptation makes it best suited for this environment?

What is used to measure volume?

Lewis is exercising and his muscles need oxygen. Which best describes how systems interact to bring his body into homeostasis? The circulatory system brings oxygen to the respiratory system, which delivers oxygen to the muscular system.

In selective breeding humans influence the course of evolution. what determines the course of evolution in natural selection

A healthy 34 year old woman who is in first trimester of pregnancy and hasn't gained any weight yet should: a. increase her calorie intake by 500-800 calories above her pre-pregnancy needs. b.

A cross section of a tree bunk shows 20 dark colored rings and 20 light colored rings what is the likely age of this tree

What side of the body is your appendix on?

Which principle was used to gather evidence that led to the big bang theory? A. Doppler shift B. radiocarbon dating C. first law of thermodynamics D. law of gravity

Ice ages can cause the extinction of animals because lack of

Which of the following is a common feature among the four inner planets? A. atmosphere composition B. distance from the sun C. rocky surface D. temperature range