10 points to first person who can help please? in biology?

Question

An echinoderm has an internal network of water-filled canals called the water vascular system..
True
False
Some sponges live on lake bottoms, while others are found on the seafloor.
True
False
Leeches are parasitic roundworms.
True
False
In clams and oysters, two shells are held together by powerful muscles—a trait common to all cephalopods.
True
False
Some sea urchins defend themselves using long, sharp spines.
True
False
If an animal’s blood never comes in direct contact with its tissues, the animal has an open circulatory system.
True
False
One of the common features of arthropods is a tough exoskeleton.
True
False

The process in which an arthropod sheds its skeleton and manufactures a larger one is called metamorphosis.
True
False
The three largest groups of arthropods are the crustaceans, arachnids, and insects.
True
False

In a lobster, the carapace is the part of the skeleton that covers the abdomen.
True
False

Answer 1

1T
2T
3F
4T
5F
6F
7T
8F
9F
10T

Answer 2

An echinoderm has an internal network of water-filled canals called the water vascular system..
True

Some sponges live on lake bottoms, while others are found on the seafloor.
True

Leeches are parasitic roundworms.
True

In clams and oysters, two shells are held together by powerful muscles—a trait common to all cephalopods.
False (cephalopods include squids and octopi)

Some sea urchins defend themselves using long, sharp spines.
True

If an animal’s blood never comes in direct contact with its tissues, the animal has an open circulatory system.
False

One of the common features of arthropods is a tough exoskeleton.
True

The process in which an arthropod sheds its skeleton and manufactures a larger one is called metamorphosis.
True

The three largest groups of arthropods are the crustaceans, arachnids, and insects.
True

In a lobster, the carapace is the part of the skeleton that covers the abdomen.
False

Answer 3

There seems to be some discrepancy in the answers everyone provided for question 6 ("If an animal’s blood never comes in direct contact with its tissues, the animal has an open circulatory system.")
If I'm not mistaken, this is certainly false. In fact, it is more accurate to say that animals with closed circulatory systems such as humans never have blood come into direct contact with their tissues. This is because in a closed circulatory system, blood is contained within blood vessels under normal situations and the nutrients in blood diffuse out into tissue fluid, which all tissues are bathed in. As a result, blood doesn't come into direct contact with the tissues other than the vessel walls (endothelium).
However, in open circulation, there are no capillaries that extend throughout the body, and blood flows freely by diffusion to all parts of the body. In this case, tissue fluid and blood are one and the same (and known scientifically as haemolymph/hemolymph), and blood has to come into direct contact with body tissues to allow exchange of nutrients and gases.

Answer 4

it's 2 am, don't you think you should've done your homework instead of trying to get the answers online? Taking biology yet, are you planning to be a doctor? In some time in the future are we going to meet and you are going to tell me you got through med school through yahoo answers???

Sorry loser, learn the way you are supposed to learn- read the book!!

Answer 5

1. True
2. False
3. False
4. False
5.True
6. True
7.True
8.False
9.True
10.False

Answer 6

do your own homework! Shame on you!!!!!

Answer 7

what a person!!!

Answer 8

T
F
F
T
F
T
T
T
F
T

Answer 9

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