Answer:
An increase in the number of snakes
Explanation:
From the food web, the only way for frog population to increase is:
1) increase of cricket population. (increased food source)
2)decrease of hawks population (less predator)
An increase in snake population will result in mice population to fall as more snakes will hunt and feed on the mice. This causes lesser mice to feed on grasses. Resulting in increased food for crickets. As time passes, due to sufficient food, cricket population will increase which in turn increases the amount of food available for frogs to eat.
Assuming the number of predators remain constant and amount of crickets (food) increases, more frogs will survive to maturity and reproduce, causing the amount of frogs to increase.
Answer:
The first one is A. The second one is A and the last one is B.
Explanation:
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Answer:
The brain and the spinal cord are wrapped in three protective layers of tissue called the meninges. The cerebral spinal fluid goes between these layers to provide more cushion and protection. It nourishes and protects the nerve tissues of the brain and spinal cord. It also acts as a shock absorber, considering humans move a lot and fall.
Motor neurons are cells that carry information from the central nervous system to the muscles and glands, while sensory neurons send signals from body parts to the central nervous system. Sensory neurons are found over the body, such as in the skin, ears, eyes, nose and tongue. Interneurons in the central nervous system allow information to flow between motor and sensory neurons.
he cell body of a neuron holds a nucleus and organelles that carry out basic cell functions, such as protein synthesis, transporting materials and producing energy. A neuron also has special parts that allow information to move. Dendrites are branch-like structures that receive signals. The axon, which often resembles a long tail, takes messages away from the cell. The axon ends in a terminal containing a chemical called a neurotransmitter, which allows the signal to move across the space between the cell that sends information and the cell that receives it. When axons and dendrites of different cells are bunched together, they create nerves. Ganglia are groupings of many neurons' cell bodies.
The processes conducted by nerve cells happen incredibly fast, in thousandths of a second. That is why the human body reacts so quickly to stimuli in the environment. A hand touching a hot stove is removed almost immediately so that serious injury does not occur.
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Answer: Electrons positioned closer to the nucleus have a greater attraction to the protons and are more likely to be discharged from the atom than electrons farther away.
Explanation: The electrons being negatively charged repel each other due to like charges. The protons being positively charged are attracted towards the negatively charged electrons.
The electrons which are near to nucleus are more tightly held by the protons and thus are more difficult to remove from the atom. The electrons which are far from the nucleus are less tightly held and are easily removed from the atom.