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seropon [69]
4 years ago
14

How many factors should a well-designed experiment test at one time? A. 1 B. 2 C. 3 D. depends on the number of experiment varia

bles
Biology
2 answers:
pishuonlain [190]4 years ago
8 0
A well-designed experiment should<span>  </span>test  1 factor at one time.
devlian [24]4 years ago
3 0
The well - designed experiment test one factor at a time. The answer to the question above is letter A. 1. The items that are being tested are the independent variables and that they cause the dependent variables to change.
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Write the common food chain of a pond ecosystem.​
kozerog [31]

Explanation:

In a freshwater aquatic ecosystem like a pond, the organisms in the food chain include algae, small animals, insects and their larvae, small fish, big fish and a fish-eating bird or animal

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6 0
3 years ago
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The Environmental Policy Act of 1969 was instituted as a follow up regulation to major environmental issues that occurred in
tatyana61 [14]

Answer:

The given statement is true.

Explanation:

The enactment of the Environmental Policy Act or the EPA in 1969 was done to monitor the issues of the environment that took place in the 1960s. It was the major and the primary law, which was postulated at that time to solve environmental issues in the United States. The enactment of the EPA law was done for various reasons, some of which are as follows:  

1. To better the health of human beings.  

2. To generate harmony between nature and humans.  

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6 0
4 years ago
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WITCHER [35]

Answer:

A. Producer, Consumer, Predator, Decomposer

Explanation:

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8 0
3 years ago
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A subatomic particle that has no charge and very small mass is called ____?
STatiana [176]
A neutron is one of the three subatomic particles, between electrons and protons it has no charge since it is neutral.
3 0
3 years ago
Please match the white blood cells with the statements that most accurately describe them to test your understanding of the beha
Artyom0805 [142]

Following are the statements:

1. Main phagocytes in circulation

2. Like eosinophils, they are involved in inflammation and allergic reactions

3. Phagocytic cells that leave circulation and differentiate into macrophages

4. Display no antigen specificity but are active against tumor and virally infected cells

Answer:

1. Neutrophils

2. Basophils

3. Monocytes

4. Natural killer cells

Explanation:

Neutrophils can be described as the most abundant type of white blood cells. They make up to 55%- 75% of the immune system.

Basophils can be described as white blood cells which are made in the bone marrow.

Monocytes can be described as white blood cells which are the largest and differentiate into macrophages and myeloid lineage dendritic cells.

Natural killer cells can be described as white blood cells which play a role in providing innate immunity.

8 0
3 years ago
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