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2 years ago

In reference to the electrical activity of the heart, what signals the end of the cardiac cycle

Biology

1 answer:

Lelu [443]2 years ago

3 0

Answer:

The electrical impulse travels from the sinus node to the atrioventricular node (also called AV node). There, impulses are slowed down for a very short period, then continue down the conduction pathway via the bundle of His into the ventricles.

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A former farmland that is now home to shrubs and small trees is undergoing

Nadusha1986 [10]

Answer:

the correct answer is secondary succession 

option "C"....

5 0

2 years ago

Select the correct cell type for each description. no distinct nucleus: can only be single-celled: can either be single- or mult

Alika [10]

Which cells have no nucleus?Prokaryotic cells (like bacteria) are very simple cells.

Can only be called single-celled?:
A unicellular organism, also known as a single-celled organism, is an organism that consists of only one cell.

Can either be single- or multi-celled:
Eukaryotic cells are cell's that form colonies with a LOT of differentiation are called multicelled

6 0

3 years ago

Number the steps of the binary fission process in correct order

kari74 [83]

Step 1:

The bacterium cell must copy its DNA so the new cells will have DNA. DNA or, deoxyribonucleic acid, has all of the information the bacterium will need to survive, so it is important it gets copied. The DNA is tightly wound so it is in a neat package called a chromosome.

Steps 2 and 3:

The bacterium now grows larger. This allows for some separation between the two DNA copies that are inside the cell. A division develops in the middle of the bacterium. This division eventually completely divides the bacterium in half. This is called cytokinesis.

Step 4:

Each cell is now called a daughter cell and they separate.

The steps of binary fission

binary fission

Binary fission results in two identical daughter cells. This is a type of asexual reproduction, or creating genetically identical offspring. If humans were able to reproduce using binary fission, it would look something like this: your mother or father would grow larger, and inside all of his or her DNA would be copied. Eventually your parent would split in half creating an identical clone.

5 0

3 years ago

Which group of animal is the closest related to reptiles?

butalik [34]

S: monotremes................................

5 0

2 years ago

When scientists have made many observations and collected existing data, they suggest a possible explanation for what they have

o-na [289]

Answer:

Hypothesis, controlled conditions, "if then" statement, scientific investigation, observation.

Explanation:

Hypothesis: An idea proposed for an argument to be tested if it's true.

Controlled Conditions: An experiment that doesn't manipulate the independent variable.

If then statements: These sentences present situations and their outcomes.

Scientific Investigation: A plan for asking questions and testing possible answers.

Observation: Using one of the senses (hearing, seeing, tasting, smell, touching) or measurements to gather data.

Let me know if you need more!

4 0

3 years ago