Which statement about crustaceans is true? *(A) all have the same number of appendages

(B) all have an internal skeleton

(C) all have an exoskeleton

(D) only some have jointed appendages

Answers

Answer 1

Answer:

C. All have an exoskeleton

Explanation:

Crustaceans is a subphylum

of Arthropoda. The study of crustaceans is knows as carcinology or crustaceology.

They are important sources of food and they consist of crabs, crayfish, prawns etc. They are closely related to insects in terms of morphological(structural) features.

Crustaceans have varying numbers and structure of appendages. However they lack endoskeletons and possess exoskeletons.

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In order to be classified in the same species, a group of organisms must be able to do what?

What kind of bones do birds have?
A. hollow
B. narrow
C. thin
D. cartilage

Answers

Hollow, that's why birds can fly. There is nothing in the bone to weigh them down.

What is the practice of growing & breeding plants and animals for human use ?

Answers

The practice of growing and breeding plants and animals for human use is called agriculture.

the practise of growing,breeding, and caring for plants and animals used for a variety of purpose is called AGRICULTURE

Which type of fossil is Gerobatrachus hottoni most likely to be?A. intermediaryB. phylogenicC. transitionalD. index

Answers

Gerobatrachus hottoni is most likely to be a : C. Transitional Fossil
Transitional fossil refer to the fossils which trains is the intermediary between it's ancestral group and derived descendant group,as a sign of evolutionary process

hope this helps

Answer: transitional

Explanation: took the test right now

A student poses the question: How does the presence of dissolved salt affect the freezing point of water? To answer this question, the student set up two conditions. In the first condition, the student added salt to water in a container and referred to this condition as the variable. In the second condition, the student did not add any salt to water in a second container and referred to this condition as the control. The student took both containers and attempted to freeze the water at various temperatures to assess the freezing point. Would this be a valid experiment? A. Yes, because there is more than one variable.
B. Yes, because there is one variable and a control
C. No, because there is not more than one variable
D. No because there is only one variable and a control

Answers

Answer:

The correct answer is option B. yes because there are one variable and a control.

Explanation:

The validity of experiments can be tested by the four components of experiments. These four components are control, dependent variable, independent variable, and constants. All of this basic component is the validity of the experiments.

In this experiment there is the control where experiment is performed within controlled and there is also one variable.

Thus, the correct answer is option B. yes, because there are one variable and a control.

Answer:

The correct answer will be option-B.

Explanation:

A scientific experiment must contain three variables: independent variable (which can be manipulated), dependent variable(which can be tested) and control (which is kept constant).

Experimental samples must be divided into two groups: an experimental group in which variable to be studied is tested and a control group in which the independent variable does not influence the experiment.

In the given question, since experimental design contains variables and the experimental as well as the control group which act as a reference group to the experiment.

Therefore, Option-B is the correct answer.

Bacteria are named primarily on the basis of their _____.