TrueFalse
lose
gain
Answer;
Complete
Valence is the number of electrons an atom must gain or lose in order to complete its outer energy level or have a stable octet in its outer shell.
Explanation;
-Valency is the number of electrons that an atom requires to gain or lose to form a complete configuration or an octet configuration.
-Atoms tend to lose or get electrons in order to achieve the electronic arrangement of atoms of the noble gases. An ion is an atom or group of atoms having an overall electrical charge. Atoms gain electrons to form cations (positively charged atom), while other lose to form anions (negatively charged atoms).
B:Stones
The egg is released from the ovary in ovulation.
B. They have a true body cavity.
C. They have two germ layers.
C. They have two germ layers.
Members of the phylum Porifera are not considered diploblastic because they do not have two germ layers. Instead, they have a unique level of organisation where their cells do not form tissues or organs. The term 'diploblastic' correctly applies to organisms like jellyfish or sea anemones that have two germ layers producing various tissues and organs.
Members of the phylum Porifera, often referred to as sponges, are not considered diploblastic because they do not have two distinct germ layers. Instead, they possess a unique level of organization in which their cells do not form tissues or organs. Confusingly however, they do have two layers of cells, but these do not equate to the germ layers seen in true diploblastic organisms like cnidarians.
In a true diploblastic organism, such as a jellyfish or sea anemone, the two germ layers - the ectoderm and endoderm, produce the various tissues and organs of the organisms. The jellyfish's tentacles and mouth, for instance, are produced by the ectoderm, while its digestive cavity is produced by the endoderm.
So, the statement that clarifies the term 'diploblastic' with respect to members of Porifera is not accurately represented by any of the provided options, since they are not truly diploblastic. The closest would be 'C. They have two germ layers', but this is still not technically correct for the reasons mentioned above.
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b. hindbrain
c. midbrain
d. split-brain