b. Secondary succession begins on soil and primary succession begins on bare rock
c. Primary succession begins when a natural disaster disturbs an ecosystem and secondary succession does not
d. Secondary succession begins with pioneer species such as lichens, and primary succession begins with shrubs and grasses
Answer:
b. Secondary succession begins on soil and primary succession begins on bare rock
Explanation:
took test :)
independently.
In contrast to a three-month-old baby, a four-month-old baby is usually strong enough to hold up its head independently.
A baby typically achieves an important developmental milestone around four months of age: developing enough neck and upper body strength to support their head on their own. This achievement reflects improved motor abilities and control over the neck muscles. When a baby can hold their head up on their own, it makes it easier for them to explore their surroundings and develop their cognitive and sensory abilities.
By offering supervised tummy time and moderate neck exercises, parents and other caregivers can support this developmental milestone. Your baby will eventually gain more control over his head movements as his neck muscles continue to strengthen, paving the way for additional physical and cognitive development.
Learn more about head movements, here:
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Answer:
the answer is head
Explanation:
just took this on OW