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Step2247 [10]
3 years ago
9

The oldest known vascular plants in the northern hemisphere are Devonian

Biology
1 answer:
mylen [45]3 years ago
6 0
<span>The oldest known vascular plants in the northern hemisphere are Devonian
This is true</span>
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Identify three environmental influences on microbial growth. How does each affect microbial distribution?
Alenkinab [10]

Answer:

1.Temperature

2.Moisture

3. PH: acidic or basic concentration

Explanation:

Different microorganism grow at different temperature. For example, many human-disease-causing microbes have an optimum temperature of 37C, and most of the bacteria do not grow at temperature higher than 45C. This means that any temperature lower than 45C will favor the growth of certain bacteria while higher temperature may cause death or reduction in the population of most. Hence, the effect of temperature on these organisms.

Water is required to dissolve the cell substances in microorganism just like higher animals.  while some can survive under an extremely dry condition, most can't and this could result in death or reduction in population.

PH, a measure of the hydrogen concentration in a solution for most microorganism is between 6-8, too much of acid or base could disrupt the activities of these organisms and a maintained range ensure an optimal survival.

6 0
3 years ago
3. What determines how many species live in a given place? And, what
Tasya [4]

Answer: Every stable population has one or more factors that limit its growth. A limiting factor determines the carrying capacity for a species. A limiting factor can be any biotic or abiotic factor: nutrient, space, and water availability are examples. The size of a population is tied to its limiting factor.  The environment, what food is there and what predators live there. How much food they get and if they are decreasing from weather, predators etc.

Explanation:

7 0
3 years ago
describe carbon cycle and explain how the burning of fossil fuels leands on an increase in ocean temperature
zysi [14]

Answer:

When fossil fuels are burned, they release carbon dioxide and other greenhouse gases, which in turn trap heat in our atmosphere, making them the primary contributors to global warming and climate change.

Explanation:

5 0
3 years ago
Chemicals called ________ are stored in neurons and released when the cell is stimulated by a signal.
Papessa [141]

Answer:

Neurotransmitters

Explanation:

Neurotransmitters are the chemicals present in the body used for the propagation of action potential. These neurotransmitters are also known as the body chemical messengers.

Neurotransmitters are stored in the neural cells. These chemicals are generally released when the cell is stimulated by the specific signal. The effect of neurotransmitter may be excitatory or inhibitory.

Thus, the answer is option (4).

7 0
4 years ago
Do y’all know what to do for this?
Rus_ich [418]

Answer:

It just seems like you're supposed to give four pieces of evidence of natural selection. If you're still confused, you can always ask your teacher.

Explanation:

7 0
3 years ago
Read 2 more answers
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