A person scratching an itch is an example of a (n)

stimulus

response to an

OA) voluntary, internal

OB) voluntary, external

OC) involuntary, internal

OD) involuntary, external

Particles that are made up of proteins, nucleic acids, and sometimes lipids and that can only reproduce by infecting living cells are called

What has prokaryotic cells in it

Name the two processes that occur during meiosis that ensure the four new cells are not identical.

Charles Darwin spent over 20 years developing his theory of natural selection. True or false?

Henry the horse has 64 chromosomes in a liver that is begining mitosis. How many chromosomes will the resulting daughter cell each have?

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.