Which are sources of adult stem cells? check all that apply. 1. bone marrow 2. amniotic fluid 3. brain  4. gametes 5. liver 6. embryo

The correct answer is -

1. bone marrow

3. brain

5. liver.

Stem cells are the undifferented cells (that is without having a specific function) of the body that are present in multicellular organisms in their adult as well as their embryonic stage.

They are capable of producing specialised cells (such as blood cells, liver cells, muscle cells etc) through a process called differentiation.

In adult stage, they are present in various body organs and tissues such as bone marrow, brain, skeletal muscles, testes, ovaries, blood vessels, liver etc.

Thus, option 1), 3), and 5) are the right answers.

"do a testcross with a homozygous recessive plant."

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.