Answer:
These are deep sea creatures and have different evolutionary phases
Explanation:
- Foraminifera is a name given to the hole beares called forams, they are a member of a phylum or class of protists, characterized by angular ectoplasm for catching their food, since they were discovered in 1854, they have been over 50,000 species and is less than 1 mm in size.
- Bering a marine organism they are commonly found in brackish, freshwaters and even terrestrial areas. Most of them are unicellular and range from algae to nutrient-poor oceanic waters most of them have a concentration of calcium carbonate.
- Evolving in seafloor is diverse and abundant also used by the oil industries which heavily depends on microfossils. Width ranges from 5.5 to 4.4 mm.
The European Energy Security Strategy (2014) which acts as guidance for these policies emphasizes the need to become less dependent on other countries.
Answer:
B and C
Explanation:
B. In a given rock sample, the amount of Silicon-32 isotopes gets divided in half about every 170yrs.
This is the concept of half-life. Half life is the time take for half of a radioactive isotope to disintegrate. The shorter the half life the faster the isotope disintegrates.
From the question, we were told that it would take 170yrs for half of the isotope of Silicon to disintegrate to Phosphorus. This is the half life.
C. The half life can be used to determine the amount of Si-32 that has decayed from the time closure temperature was reached.
The closure temperature is very important in radioactivity. It is the temperature at which a system has cooled and there is no resulting disintegration of parent and daughter isotopes.
From first order kinetics, we know that the rate at which radioactive elements decay at any time is directly proportional to the number of radioactive atoms present. A knowledge of the half life helps to figure out the number of atoms that has decayed in time.
Since many countries<span> with </span>malaria<span> are </span>already among<span> the </span>poorer nations<span>, the </span>disease maintains<span> a</span>vicious cycle<span> of </span>disease<span> and </span>poverty <span> the least-developed </span>countries in<span> the world, with high infant mortality rates and low life expectancies. </span>True<span> or </span>False<span>? Sub-Saharan Africa is home to the poorest people of the world.</span>
