Why are arteries thick walled while veins are thick walled

Diffusion of water across a membrane from areas of higher concentration to areas of low concentration is called

How can life form live in extreme environments?

Why can't muscles function individually

For the following statement, determine whether the statement is true for a prokaryotic cell, a eukaryotic cell, or both. 'I contain membrane-bound organelles.' A. prokaryotic cell B. eukaryotic cell C. both

How do organisms affect the cycling of elements and water through the biosphere?

I'm writing a 5 para for science ab skin cancer. i have a lot of info but i am having trouble wording it. how should i paraphrase this? "Skin cancer is the uncontrolled growth of abnormal skin cells.

Speciation that results from the formation of a geographic feature that isolates some members of a population from other members is an example of: a. allopatric speciation b. directed speciation c. stabilizing speciation d. sympatric speciation

Vegetative plant organs are the root, stem, and leaf. Each organ has a specific function for the survival of the plant. Which organ is the part of the plant that supports the leaves and flowers?

Which molecule is synthesized by plants and is a major source of energy for plants and animals?

A biology student wants to understand how blood flows through the aorta. To model the heart and aorta, she sets up two identical pressure-controlled tanks that push blood through a 2-centimeter diameter tube. Her results are shown in the table below.