The organs of the heart and the blood vessels form which of the followings?

A. a cell

B. a tissue

C. an organ

D. an organ system

Identify at least three similarities in the two types of feedback mechanisms answer

A large part of a plant's mass comes from water taken up by the plant's roots. A. True B. False

Which phrases describe foliated rocks? Check all that apply. Tend to break in half grains arranged randomly grains form in parallel layers tend to split apart along bands grains arranged in increasing size

What makes up a cell membrane

1. Why do the receptor proteins need to be on the outside of the cell? 2. Why can some molecules like water and glucose easily pass through the membrane but macro molecules like starch cannot?

Explain three disadvantages to using an electron microscope to view microorganisms.

What are the two strands of dna held together by?

Using context clues, what does predecessors mean as it is used in the first paragraph

Explain how fossil fuels found in the Earth's crust are ultimately the result of biological processes.

the trait for flower color is highly variable among certain species of rose plants leading to the formation of flowers of different colors. how did the flower color variation in rose plants come about