Answer:
Malthus.
Explanation:
<em>Malthus formulated what is today known as the Malthusian catastrophe during which he explained that limited resources put a check on the population of humans. He further explained that limited resources will provoke competition.</em>
<em>Darwin later adopted the idea of competition to develop the theory of survival of the fittest, also known as natural selection.</em>
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Answer:
The correct answer is - contractile vacuoles: osmoregulation by contraction and expansion,
other vacuoles: storage of nutrients, water, and waste also help in maintaining shape.
Explanation:
Contractile vacuoles are the characteristic features of the protozoan, unicellular algae that helps in expelling water by the process of osmoregulation by expansion and contraction.
Other vacuoles are primarily the storage unit of the cell as they store excess nutrition, waste or water in it. It also helps in maintaining the shape of the cells.
Thus, the correct answer is - contractile vacuoles: osmoregulation by contraction and expansion,
other vacuoles: storage of nutrients, water, and waste also help in maintaining shape.
Answer: The organism is Streptococcus pneumoniae
Explanation:
Pneumonia is a respiratory condition characterized by an acute or chronic inflammation of the lungs.
It can be caused by virtually many kinds of microorganisms such as viruses, bacteria, fungi; even by some toxic matter.
However, the organism commonly encountered in the microbiology laboratory examination is a bacteria named Streptococcus pneumoniae
Answer:
D) The porcupine is showing a physical characteristic adaptation and the opossum is showing a behavioral adaptation.
Explanation:
Adaptation, which refers to the ability of an organism to adjust to changes in their external environment in order to survive, is of different types namely: physical/structural, behavioral etc.
- A physical or structural adaptation is a possessed physical characteristics/traits of an organism that enables it adapt.
- A behavioral adaptation is an organisms change in behavioral pattern or responses made to changes in the environment.
According to this question;
- A porcupine is said to have quills on its back which helps protect it from predators. This shows an example of STRUCTURAL or PHYSICAL ADAPTATION, which is the QUILLS it possesses.
- An opossum is said to pretend to be dead and become stiff when threatened. This is an example of BEHAVIORAL ADAPTATION because the opossum responds behaviorally to being threatened.
A feature of a pedigree that indicate that a certain trait is a dominant trait is that one of the parents always have to have the trait.
There are, however, autosomal dominance and X-linked dominance.
For an autosomal dominant trait:
- Appears equally frequent in both sexes.
- Both sexes transmit the trait.
- Present in all generations.
- When one parent has the trait and the other doesn't, approximately half of the offspring will present the trait.
For a X-linked dominant trait:
- Both male and females can present the trait, but more females usually present it.
- Sons with the trait always have a mother that presents the trait as well.
- Daughters with the trait always have either a mother or father that presents the trait, or both.
- Fathers with the trait always have daughters with the same trait.
