When materials diffuse across a membrane, they move from of concentration to an area of concentration along the concentration gradient.

When materials diffuse across a membrane, they move from an HIGHER area of concentration to a LOWER area of concentration along the concentration gradient.

Explanation:

A concentration gradient is the process where particles, also called solutes, move through a solution or gas from an area (usually separated by a membrane) with a higher number of particles to an area with a lower number of particles, in other words, from a higher concentration area to a lower concentration until the concentration of substances is uniform throughout.

I hope you find this information useful and interesting! Good luck!

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation: