Answer:
A. A weak or strong current
Explanation:
D. is inccorect because rivers are always freshwater
C. is incorrect because seawater is salt water
B. is incorrect because rivers have waterflow.
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Answer:
This process is called aerobic respiration because it requires air (oxygen). In the absence of oxygen, the cell uses a process called anaerobic fermentation. or simply fermentation. ... Because aerobic respiration breaks the sugar all the way down, it releases much more energy than fermentation.
Answer:
Explanation:
Both the B cell membranes and the cancer cells are composed largely of phospholipids. Explain how the polar parts of the phospholipids from one cell interact with the phospholipids from the other cell when the membranes are fused, and how the nonpolar parts of one-cell phospholipids interact with the phospholipids from the other cell.
The polar parts of the phospholipids (hydrophilic head) from one cell to the other dissolve in water when the membranes are fused, and form hydrogen bonds with water. The non-polar portions of the phospholipids (hydrophobic tail) from one cell to the next to prevent water. They build a lipid bilayer between the hydrophilic heads where the hydrophobic tails are in between.
The heads are exposed to water when this layer is formed, while the tails only communicate with other tails, not the water.
Over Earth's history a number of supercontinents are thought to have existed. The most recent and well understood is the supercontinent known as Pangaea, which formed approximately 335 million years ago and began to break up into the continents we know today, from about 175 million years ago.
It's important to understand that the Earth's crust and it's land masses are in constant flux over geological time. Tectonic plates are shifting continuously and over millions of years this causes land masses to collide and split apart. The way we see the land mass (countries and continents) distributed on a world map today is simply a snap shot in Earth's history. It was a vastly different picture 100 million years ago and will be a vastly different picture in 100 million years. The Himilayan mountain range in Asia is growing today at a rate of about 1cm per year as the Indian and Eurasian tectonic plates continue to collide and thrust up crust material to produce the mountains.
The evidence to support the supercontinent theory is not just in tectonic plate theory, it's in the relationships between life on and between different continents. When land masses split and separated populations of plants and animals, they evolved differently to form new species. The intricacies of these inter-species relationships and genetic heritage can be used to track the nature of how the landmasses interacted over time.
The null hypothesis is: there is no significant effect negative effect of increasing caffeine concentrations in nectar on the number of floral visits by bees.
If the number of floral visits by bees decreased with increasing nectar caffeine concentration, the null hypothesis is rejected. If there were no significant changes, the null hypothesis is not rejected.
<h3>What is a null hypothesis?</h3>
A null hypothesis a hypothesis which states that there is no significant difference between two populations or sample under study.
A null hypothesis can also state that there is no significant difference between variables in a study.
The experiment is to test potential negative effects of increasing caffeine concentrations in nectar on the number of floral visits by bees.
The null hypothesis is that there is no significant effect negative effect of increasing caffeine concentrations in nectar on the number of floral visits by bees.
The experiment will be designed as follows:
- Four potted plants with normal nectar caffeine concentration (serving as control), x2 nectar caffeine concentration, x3 nectar caffeine concentration, and x5 nectar caffeine concentration are obtained and kept in a garden.
- The number of floral visits by bees are recorded after 15 days.
If the number of floral visits by bees decreased with increasing nectar caffeine concentration, the null hypothesis is rejected. However, if there were no significant changes, the null hypothesis is not rejected.
In conclusion, a null hypothesis is a hypothesis of no significant difference.
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