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blsea [12.9K]
3 years ago
14

How do earthworms get oxygen to their cells?

Biology
1 answer:
Ksju [112]3 years ago
7 0

They breathe through their skin. Air dissolves on the mucus of their skin, so they MUST stay moist to breathe.

If worms dry out, they suffocate. As fresh air is taken in through the skin, oxygen is drawn into the worm's circulatory system, and the worm's hearts pump the oxygenated blood to the head area.

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Which statement BEST describes the source of new combinations of alleles in a zygote?
lana66690 [7]

C...both sperm and egg genetic material can be rearranged during their generation (meiosis).

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3 years ago
What is the average atomic mass of a sample that has two isotopes, one with a mass of 21 amu at 62% abundance and another with a
motikmotik

Answer:

Average atomic mass = 21.38 amu.

Explanation:

Given data:

Mass of first isotope = 21 amu

Abundance of first isotope = 62%

Mass of second isotope = 22 amu

Abundance of second isotope = 38%

Average atomic mass = ?

Solution:

Average atomic mass  = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass  = (62×21)+(38×22) /100

Average atomic mass =  1302 +836 / 100

Average atomic mass = 2138 / 100

Average atomic mass = 21.38 amu.

3 0
3 years ago
Explain the relationship between the biosphere and biodiversity.
marissa [1.9K]
The biosphere is the worldwide sum of all ecosystems. Biodiversity is the variation of genetic species in the ecosystem.

hope this helped :)
6 0
3 years ago
Cell differentiation in multicellular organisms allows cells to?
Finger [1]
Is the process where a cell changes from one cell type to another..
5 0
3 years ago
The phylogenetic tree illustrates the relationship between humans and our closest living relatives. The tree was based on bioche
lana66690 [7]
Hello there,

1.) According to the biomolecular data, we COULD infer that <span>humans are more closely related to chimps than any other apes. 

2.) </span>Based on the cladogram, if moths undergo complete metamorphosis, we would MOST LIKELY infer that <span>butterflies and flies do as well. 

3.) </span>According to the cladogram, which of these were the direct ancestors of the Kingdom Fungi? <span>Protista 

4.) </span>Trey is looking at a cell under the microscope. It is attached to many other cells, and it has a nucleus and membrane bound organelles. It has no cell wall. In which kingdom should this organism be classified? <span>Fungi 

5.) </span>A review of the cladogram shows a common ancestor for these four types of vertebrates. Which statement BEST explains the genetics represented by the cladogram? <span>Lizards and snakes are more genetically alike than lizards and birds. 

Hope this helps

-HotTwizzlers :D
</span>
8 0
3 years ago
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