Which is a requirement for natural selection to occur?(a) heritable variations for some traits
(b) the ability of an organism to improve a trait during its lifetime
(c) equal probability of survival for all offspring
(d) fewer offspring than the environment can support

Answer:

C. Vestigial

Explanation:

Vestigial is a type of structure or organ which is used in ancient times in the body but now it has no use due to changes that occurs in the organisms with the passage of time. Human appendix is the example of such structure. Human appendix helps in the digestion of food materials or part of digestive system but now it has no function in the human body.

The human appendix is an example of a vestigial structure. The correct option is option vestigial (c).

Vestigial structures are anatomical features or organs that have lost most or all of their original function in the course of evolution.

While they might have had a purpose in the ancestors of the species, they are now considered non-functional or have reduced functionality in the modern form of the organism.

Despite the appendix no longer serving a clear purpose in humans, it is believed to have had a digestive function in the past.

Therefore, The correct option is option vestigial (c) and The human appendix is an example of a vestigial structure.

To know more about the vestigial:

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Question: why do so many animals in the taiga experience a seasonal color change?

Answer: it must account for summer and winter conditions.

Explanation: white fur is effective camouflage in winter but not the summer so not every animal can change its fur they only have one color thats affective one season so its hard for survival in summer if you have white fur

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(jacemorris04)

Answer:

2. uranium would be the best answer

Answer:Within the cell, the endoplasmic reticulum synthesizes lipids and proteins. ... Proteins that are made in the cell for use by the cell-for instance, as channels in the plasma membrane-are made by the free ribosomes that dot the cytoplasm. Two types of endoplasmic reticulum are found in the eukaryotic cell.

Invasive species can either replace an organism from the ecosystem food web or replace it.  

Explanation:

• Invasive species are non-native species which can be animals, plants, micro-organisms, fish, etc. they are very much threatening to the native species and ecosystem food web.
• Invasive species are spread by humans mostly, it happens unintentionally when people travel and all. Even climate change could be a reason for its spread.
• So, it becomes threatening to native species because when you introduce it into a new ecosystem, it does not have a predator or control. It grows aggressively and takes over the resources for the native species.