Answer:
hydrogen and helium couldn't form until the universe had cooled enough to allow their nuclei to capture electrons, about 380,000 years after the Big Bang. Within about 3 minutes after the Big Bang, conditions cooled enough for these protons and neutrons to form hydrogen nuclei.
Explanation:
The correct answer is 12%.
The chemical element carbon-14 is a radioactive isotope that has 6 protons and 8 neutrons. Since it can be found in all organic materials, its primary utility is for dating organic specimens.
This is due to the fact that carbon-14 slowly declines year after year when an organism dies, while carbon dioxide has a life span of between 5000 and 30000 years. Although a mathematical function determines how it diminishes, graphics like the one below can help explain the process.
The graph depicting the carbon content of organic materials in fossils that are 17,000 years old shows that carbon-14 makes up around 12% of the total carbon content.
To learn more about Isotopes of Carbon refer the link:
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Answer:
c) Because enzymes are proteins, they have a very specific order of amino acids that make up their structure (including the active site), meaning that only one key can fit in. The active site, or "lock" will recognise the substrate or "key" and will only let that one in and therefore can only catalyse a specific reaction.
b) the transcription process delivers information from the DNA to the protein-building machines.
Explanation:
I'm sorry I could only these question, I don't understand 3 a) question, hope this helps!
The answer is natural selection. Charles Darwin popularised
the term "natural selection". The change in the heritable traits
characteristic of a population over generations. Natural selection is reproduction
of individuals due to differences in phenotype and the differential survival It
is a key mechanism of evolution.