Ecosystems have trouble adjusting to short-term changes - This is false.
Eco system changes can be long term and short term. Few short-term environmental changes that can change an eco system are - drought, smog, volcanic eruptions, floods etc. An ecosystem can easily adapt to short-term changes. For example, after a forest fire plants can re-grow from their roots. Many species have features to help them cope with natural, short-term environmental changes.
According to a study by Mohoney and others, a lower level of executive attention in order adults was linked to low blood pressure,which likely is related to reduce blood flow to the brains frontal lobes .Executive attention in blocking potentially which distract information from the focus of attention.
Answer:
The most recent common ancestor of all currently living organisms is the last universal ancestor, which lived about 3.9 billion years ago. ... 6,331 groups of genes common to all living animals have been identified; these may have arisen from a single common ancestor that lived 650 million years ago in the Precambrian.
Food enters the stomach during the third stage of digestion, hope this helps.
Answer:
500-700 kg
Explanation:
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