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mina [271]
4 years ago
14

On average, what percentage of infants born to 45-year-old mothers have down syndrome

Biology
1 answer:
insens350 [35]4 years ago
6 0
Probably 3 %. a mother could give birth to a child with Trisomy 21 at any age because Trisomy 21 is a mutation and mutations happen all the time. Not all mutations are as Down Syndrome. A child born to two homozygous brown eyed parents could be born with blue eyes even if no one in the family had blue eyes. The child would develop blue eyes due to mutation.

Write in on google this same exact question and you'll find other questions too in quizlet that have answers
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Salt marshes along the coast serve as a nursery site for juvenile fish including those that are important to the fishing industr
alex41 [277]

Given what we know, we can confirm that Salt marshes are an example of an ecosystem service.

<h3>What is an ecosystem service?</h3>

This describes situations in ecosystems that are beneficial to human life. This example describes the way in which salt marshes provide humans with a steady and stable source of fish that are important to the fishing industry.

Therefore, we can confirm that the Salt marshes are an example of an ecosystem service.

To learn more about ecosystems visit:

brainly.com/question/1673533?referrer=searchResults

6 0
2 years ago
The species of which of these groups show neither wings nor antennae? Crustaceans/ Insects/ Arachnids
kondaur [170]
The answer is Arachnids.


Crustaceans, Insects, and Arachnids belong to the phylum Arthropoda.
Of mentioned characteristics, most of the Insects have both wings and antennae. Remember all butterfly, bees, beetles, etc. Crustaceans (crabs, lobsters, shrimp, etc) have antennae, but they have no wings.

Thus, the only group of the mentioned that shows <span>neither wings nor antennae is Arachnids. Arachnids include scorpions, spiders, ticks, etc. and as it is known, these groups have neither </span><span>wings nor antennae.</span>
6 0
3 years ago
Read 2 more answers
Where do the light dependent reactions take place?
weqwewe [10]

Answer: C. Thylakoid membrane

Explanation: which is placed in chloroplast... And chloroplast is in plants and they can use light to produce glucose.

4 0
4 years ago
Which part of the female reproductive system is highlighted below?
andrew11 [14]

Answer:

Ovary

Explanation:

I may be wrong because of the way that question is worded/shown tho

6 0
4 years ago
Read 2 more answers
What is the dorsal surface called in four legged animals?
lora16 [44]
The dorsal surface in for legged animals is called superior
3 0
4 years ago
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