Answer:
Cretaceous
From their earliest diversification in the Cretaceous Period (145 million to 66 million years ago), angiosperms rapidly came to dominate the land flora. Today there are more than 300,000 species of flowering plants, which account for more than 90 percent of the diversity of vascular plants.
Explanation:
<em>Mitochondrial DNA typing</em><em> </em><em>-</em>
This method is mainly used by forensic scientist who investigate crime scenes.
It involves the use of DNA from an unknown sample to match a DNA collected from a crime scene.
This method is normally used in special scenarios.
These scenarios include:
1) When the DNA is discarded.
2) When the sample does not contain nuclear DNA.
From the description above we can now answer the question as follows:
an unknown nuclear mtDNA is matched to a nuclear mtDNA found at a crime scene.
Answer:
Liquid ammonia is liquefied ammonia and is basic in nature. It dissolves in water to give ammonium hydroxide which ionizes to give hydroxyl ions. Therefore it turns red litmus blue and phenolphthalein solution pink.
Answer:
A. Bacterial species use a limited number of nutrient sources.
Explanation:
There are two classes of nutrients that are indispensable to bacteria: macronutrients (carbon, oxygen, nitrogen, sulfur, phosphorus and hydrogen) and micronutrients (iron, zinc, manganese, calcium, potassium, sodium, copper, chlorine, cobalt, molybdenum, selenium, magnesium, among many others). But it takes more than the nutrients for them to feed, it takes the metabolism, because it is through it that they transform what they have into food.
The absorption of nutrients to carry out the metabolism only occurs because there are growth factors (environmental) that influence the development of the bacteria. Some examples of these factors are: light, temperature, pH, oxygen and osmotic pressure. Each organism has an optimal growth temperature, or a favorable pH to successfully carry out its metabolism. This will vary from species to species.
The answer will be Endoplasmic Reticulum (ER).
It is a kind of channel that carries substances, such as proteins, oil droplets, water, to other parts of the cell.
Well, to make it easier, endoplasmic reticulum is actually a fancy way of saying "cellular highway". I will explain to you why. I always like to study BIOLOGY relating our activities and our stuff.
Okay, let's push aside cells. Let's think of us, humans. We can't stay in one place, we gotta moving all around the city. What do we use for moving around the city: either roads or sidewalks or footpaths.
Just like that, a cell also has a medium or road or a channel where all the substances can move around the cell. Well, its ER! So, from now on, everytime you are struggling with this difficult, L O N G word, just replace it with "cellular highway". The ER is like a water pipe, too. Water flows through it. Here, cellur substances flow through it. The ER is connected to the nucleus.
SUMMARY:
1# ER aka Endoplasmic Reticulum is a kind of channel that carries substances, such as proteins, oil droplets, water, to other parts of the cell.
2# Try thinking it easy: replace it with "cellular highway".
3# It is much like the roads or sidewalks, we walk on.
