Scientists use the presence of water as a measure of possibility of life on a planet. knowing that the surface temperature on mars averages -67 degrees fahrenheit, do you believe that the properties of water would support life? why or why not?

The water present on the surface of mars does not exist in the free form like the water on the Earth. The water exists in the form of hydrated salts and in the saline form underground the surface of the Mars. The microscopic life forms that may develop will have use the water from the salts as this water can never freeze. The same goes for for the highly saline water that is under the ground. It doesn't freeze. This water can make it possible for the various microbes to live insulated from the cold temperatures while making the exchange of liquids possible for the cells.

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 denominator has a very specific role.