1. which of the following is correct with respect to seismic waves?
a) the fastest waves are s-waves, followed by p-waves, and then surface waves.
b) both primary and secondary waves are seismic waves, but surface waves are not seismic waves.
c) primary waves can travel through solids and liquids, secondary waves can only travel through solids.
d) primary waves are the most destructive because of their circular and rolling motion on earths surface.

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:

compost can be added to topsoil as a:

pesticide