Drag each tile to the correct box. Not all tiles will be used. One statement is an example of a scientific observation. Another statement is an example of a scientific explanation.

Identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

Monotremes are mammals that
have significantly different body
structures and reproductive
strategies from other mammals.

Monotremes have likely undergone
an evolutionary history that is distinct
from other types of mammals.
People should ignore all evidence
indicating that most species of
dinosaur went extinct at the
end of the Cretaceous period.
It is not possible to collect
evidence supporting or challenging
the standard model of quantum
mechanics.
It is unnecessary to research
the composition and origin of
elementary particles because
the Bohr model is accurate.
Flaws in the Bohr model of the
atom should be used to discredit
the idea that all matter is made
up of atoms.

mpntremes, body, flaws, bohr, particle, evidence, research, all of the above

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: