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Alchen [17]
2 years ago
6

The algae at the beginning of the food chain is a_______.

Biology
2 answers:
allochka39001 [22]2 years ago
7 0
C. Producer
Because it gets energy from the sun and not consuming a plant or animal
podryga [215]2 years ago
4 0

Answer:

c

Explanation:

yep

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Which of the following mechanisms is used by gram-negative bacteria to cross the blood-brain barrier?
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Answer:

Which of the following mechanisms is used by gram-negative bacteria to cross the blood-brain barrier? D) Inducing TNF

Explanation:

The blood brain barrier is a barrier formed by brain microvascular endothelial cells, astrocytes and pericytes. Pathogens can cross this barrier by using different mechanisms. The Tumor Necrosis Factor (TNF) is the way gram-negative bacteria cross this mentioned blood-brain barrier.

3 0
3 years ago
if an element has a half-life of 30 million years and there is 12.5% of it remaining in a rock, how old is that rock
Assoli18 [71]

Answer:

The half-life of a substance is the amount of time it takes for half of that substance to decay. However, after two half-lives, half of the half remaining will decay, leaving you with one quarter of the original substance.

So, after 1 million years you will have 50% of the original substance remaining.

And, after 2 million years you will have 25% of the original substance remaining.

After 3 million years you will have 12.5% of the original substance remaining.

And after 4 million years you will have 6.25% of the original substance remaining.

Explanation:

Hope it helps:)

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3 years ago
Sidra has a baby that was born at 27 weeks. her baby is considered:
andreev551 [17]

The baby is considered as extremely preterm infant.

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Premature births are one of the major causes of death of children under the age of 5 years. The babies that survive may have problems and may be  visual or hearing impaired, may have learning disabilities etc.

7 0
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