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katovenus [111]
3 years ago
6

What is true about heart valves?

Biology
1 answer:
NemiM [27]3 years ago
8 0
C.they separate atria from ventricles, and ventricles from the large arteries that leave them.
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Darwin studied actual birds on the Galapagos Islands instead of using a simulation, as you did in this lab. Studying natural sel
Papessa [141]
Properly identifying each species.
Accurately recording his findings.
Not interfering with ecosystem while studying the birds.
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2 years ago
Read 2 more answers
Scientific Processes 2
valentina_108 [34]

Answer:

false

Explanation:

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2 years ago
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DDT is an insecticide that was formerly used to control insects that would eat crops. It was banned from use in the 1970s.
Reil [10]
<h2>It contains toxins</h2><h2>It killed off bird populations.</h2><h2>It caused harm to human populations.</h2>

Explanation:

Let us understand the term DDT

DDT : Dichlorodiphenyltrichloroethane

  • This is a crystalline chemical compound
  • Basically used for protecting insects eating crops
  • It is colorless, odorless, tasteless
  • Initially used as pesticides

It killed off bird populations: Though it does not kill birds directly by consuming, it has indirectly damaged the egg by making the egg's shell too thin which gets broken easily.

It controlled diseases like malaria: Since this option talks about positive attribute of DDT, this option stands invalid. This chemical compound controls mosquitoes attacking the crop.

It caused harm to human populations: DDT causes vomiting, tremors or shakiness, and seizures

It contained toxins: It contains moderate toxins.

5 0
3 years ago
Phenylketonuria (PKU) is an inherited disease caused by a recessive allele. If a woman and her husband, who are both carriers, h
sergejj [24]
If they are both carriers , we can create a cross with Rr.

The probability of not even carrying PKU is 1/4 or 25%
The probability of carrying is 2/4 or 50%

And the probability of inheriting the disease PKU is 1/4 , 25%

5 0
2 years ago
Which factor determines if someone has brown eyes or green eyes A. several dominant alleles B. one allele from each parent C. on
Romashka [77]

Answer:

B One allele from each parent

Explanation:

You have dominant genes (brown eyes) and recessive genes (green eyes)

In order for a child to be born with brown eyes only one parent needs to have brown eyes. Having green eyes is recessive so either both parents need to have green eyes or neither of them needs to have them. But if one parent has green eyes and the other has brown eyes, then the brown eyed gene will almost always  dominate the green eyed one.

I hope this helps! :)

4 0
3 years ago
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