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yarga [219]
3 years ago
12

The crown-of-thorns sea star, Acanthaster planci, preys on the flesh of live coral. If coral animals are attacked by these sea s

tars, then what actually provides nutrition to the sea star, and which chemical (besides the toxin within their nematocysts) do the corals rely on for protection?
A) medusae; silica
B) polyps; silica
C) exoskeleton; calcium carbonate
D) polyps; calcium carbonate
Biology
2 answers:
julsineya [31]3 years ago
8 0

Answer:

d) polyps; calcium carbonate

Explanation:

The Acanthaster planci It is a kind of invasive starfish, which destroys corals: it has poisonous spines and feeds on coral polyps at the expense of the reef.

On the other hand, CO2 reacts with water, forming carbonic acid and reducing the available calcium carbonate, an essential element so that marine organisms, from clams to hedgehogs, can form their skeletons and shells.

Rufina [12.5K]3 years ago
5 0

Answer:  The correct answer is :  D) polyps; calcium carbonate

Explanation:  This starfish feeds exclusively on hard corals. It can be brown, dark gray, purple, orange or red, the difference in color lies in the food they eat. It has its body covered with thorns that uses them as a means of defense.

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Fruit production in anthophytes develops from: a. a female reproductive structure b. a male reproductive structure c. both male
Fed [463]

Answer:

a. a female reproductive structure

Explanation:

Reproduction can be defined as a biological process which typically involves living organisms producing an offspring.

Basically, there are two (2) methods of reproduction and these are;

I. Sexual reproduction: it involves the combination of the genome (gamete) of a male and female living organism during fertilization.

II. Asexual reproduction: it involves the cloning of a living organism to produce an offspring because there is only a single parent.

Antophyte is the division name for flowering plants and they are considered to be the most successful of all the other division of plants in terms of reproduction.

Division Antophyta are classified into two (2) main categories and these includes;

I. Monocot: this group of flowering plants have a single cotyledon. Some examples of monocots are lilies, corns, grasses etc.

II. Dicot: this group of flowering plants have two cotyledon. Some examples of dicots are beans, peas, peanuts, etc.

Basically, fruit production in anthophytes develops from female reproductive structure known as the ovary. Once the ovary is fertilized by a sperm, they ripen into a fruit.

3 0
3 years ago
Pls help asap!!!!!!!!!!!!!!!!!!!!!!!!
rosijanka [135]

Answer:

1.  the DNA of which has been modified using genetic engineering methods. In most cases, the aim is to introduce a new trait to the plant which does not occur naturally in the species.

2. GM crops are made through a process known as genetic engineering. Genes of commercial interest are transferred from one organism to another. Two primary methods currently exist for introducing transgenes into plant genomes. The first involves a device called a 'gene gun'.

3. Crops do not damage the environment simply because they are GM. Some farming practices, such as the overuse of herbicides resulting in the excessive eradication of wild plants from farmland have been shown to harm the environment. These problems are similar for non-GM and GM crops.

3 0
3 years ago
Which structure is used by the organism for defense?
serious [3.7K]

Answer:

C.

Explanation:

5 0
3 years ago
!!!!!How do radioactive elements help scientists establish how old rocks and fossils are?!!!!
MAVERICK [17]

Answer:

I will give a hypothesis. Just like a tree, when you cut a tree by its trunk, you will the rings. The rings around it represents the tree's age. So when you cut rock, the pores in the rock determine whether it is an old rock or a fossil rock.

Explanation:

The reason is, if it is limestone and it is an old rock, the pores will be slightly big and if the limestone is a fossil rock, then the pores will be bigger due to leaching or denaturing of the minerals in the rock through the ages.

6 0
2 years ago
HELP! Which characteristic of life is demonstrated when eagles use their sharp talons to get fish out of the water.
Anika [276]
The answer is D. Instinct

Eagles evolved better over the years to hunt their targets easier, which explains why they have sharp talons, they instinctively use them to hunt their prey.
3 0
3 years ago
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