Questions 1. What are the levels of organization?
2. What is the relationship between a cell, tissue, organ, organ system and organism?
3. Why don't levels of organization apply to unicellular organisms?
4. How would organelles fit into the levels of organization?
5. Draw a diagram that would help you visualize the relationship between the five
levels of organization.

cell

tissue

organ

system

human organism

Explanation:

unicellular organisms only have one cell since two or more cells form a tissue their level of organization is restricted to cell

cell

two or more cells form a tissue

two or more tissue forms an organ

two or more organs form a system which must work in coordination for efficiency

two or more systems make up a human organism

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:

the man is bald so he has no hair to get wet