Aprotein channel, like the peripheral and integral proteins in the diagram, is a transport protein that. a. always moves substances against a concentration gradient. b. always moves substances with a concentration gradient. c. serves as a tunnel for specific substances. d. always requires energy from the cell. i'm thinking a or d but i'm not sure.

Which of the following is an example of competition that could be found in a forest? question 14 options: deer eat berries and their droppings seed new areas creating more berry bushes two fox populations utilize the same rabbit population as their main food source two hawk populations utilize the same scorpion population as their main food source lack of sunlight due to changes in the seasons restricts the growth of certain plants

Which worm has eyespots that are used to detect light? a fluke b marine worm c planarian d tapeworm

Hemoglobin is a proton that carries oxygen around the body what is hemoglobin made from