Natural selection. The trait that is unfavorable to the baby giraffe's survival will cause the death of giraffes with that specific gene that is responsible for a short neck vs a long neck. Natural selection causes traits that help the survival of the species will be carried throughout generations while unfavorable traits will be lost.
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uuh, well, the guy that answers the questions with the link is a scammer and DO NOT click the link! it'll ask u to download stuff to ur computer/phone that you have no idea what it is-then u'll have to go and manually uninstall the things it made you download, which is such a pain. the guy also goes by many accounts that start with a b and has no profile pic, and if they answer the question, their answer is immediatly deleted but takes like a day for someone else to answer the question b/c it takes forever to process for that person's account/answer to be deleted-id k why- it just does
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Sometimes molecules cannot move through the cell membrane on their own. These molecules need special transport proteins to help them move across the membrane. Facilitated diffusion is the diffusion of substances with the help of transport proteins in the plasma membrane. These special proteins are called channel proteins or carrier proteins, and they are attached to the cell membrane. In fact, they go through the cell membrane, from the inside of the cell to the outside. Facilitated diffusion is used for molecules that cannot diffuse rapidly through cell membranes on their own, even when the molecules are moving from high to low concentration areas. An example is the sugar plants and animals use for energy, called glucose. Even though facilitated diffusion involves transport proteins, it is still passive transport because the solute is moving down the concentration gradient so it does not require the use of cellular energy.
Low levels of estrogen is a sign that the ovaries of a woman are beginning to fail. This is a common occurrence when one is at menopausal stage. Estrogen and progesterone naturally decrease and eventually stops the menstrual cycle. Hope this helped.
Also called simple sugars, they are the most basic units of carbohydrates
