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NeTakaya
3 years ago
10

Modern corals are restricted to growing in warm, clear, well-lit, shallow water. Over the last two million years, coral reefs ha

ve undergone periods of great growth as well as mass extinctions. All BUT one catastrophic event has contributed to the changes in reefs over the years. That is
Biology
2 answers:
coldgirl [10]3 years ago
6 0

Answer:

C) destruction of the rainforest.

vova2212 [387]3 years ago
5 0

The answer is Climate change. It will take decades for the coral reef to recover from the catastrophic climatic changes including El Nino in 1997-98. Climate Change is the main and undeniable threats to the loss of the corals. It has negative effects on coral populations in some ways. This includes the Color Bleaching, Coral Disease, and Ocean Acidification. 

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A forest fire destroys an area. Asmall population of trees and a large population of birds are both affected.
Afina-wow [57]
A. density dependent.
4 0
3 years ago
A large number of disease-free individuals were enrolled in a study
Nuetrik [128]

Answer:

a,Answer: Type I right censoring, censoring time = 60.

b.This is called an Interval censoring,

c.this is called Random censoring because the year in consideration was chosen at random, censoring time = 61.

d.The observations are left truncated respectively at age 30, 40, 50 and 42.

e.L\alpha \frac{S(60)}{S(30)} *\frac{S(52)-S(55)}{S(40)} *\frac{S(61)}{S(42)} *\frac{S(55)}{S(50)}

Explanation:

a) A healthy individual, enrolled in the study at age 30, never developed

breast cancer during the study.

Answer: Type I censoring, censoring time = 60.

(b) A healthy individual, enrolled in the study at age 40, was diagnosed

with breast cancer at the fifth exam after enrollment (i.e., the disease

started sometime between 12 and 15 years after enrollment).

THis is called an Interval censoring,

if the clinical exams is conducted every three years , then 3*4=12, and 3*5=15

add this to 40 years respectively, we have

censoring time = (52, 55]

c) A healthy individual, enrolled in the study at age 50, died from a

cause unrelated to the disease (i.e., not diagnosed with breast cancer

at any time during the study) at age 61.

this is called Random censoring because the year in consideration was chosen at random, censoring time = 61.

(d) An individual, enrolled in the study at age 42, moved away from

the community at age 55 and was never diagnosed with breast cancer

during the period of observation.

Random censoring, censoring time = 55.

The observations are left truncated respectively at age 30, 40, 50 and 42.

e.  Confining your attention to the four individuals described above,

write down the likelihood for this portion of the study.

L\alpha \frac{S(60)}{S(30)} *\frac{S(52)-S(55)}{S(40)} *\frac{S(61)}{S(42)} *\frac{S(55)}{S(50)}  

the above represent the likelihood

3 0
3 years ago
Oxygen was initially created in Earth's atmosphere by _____.
Evgen [1.6K]
Oxygen was initially created in Earth's atmosphere by algaes. It is estimated that marine plants produce between 70 and 80 percent of the oxygen in the atmosphere. Nearly all marine plants are single celled, photosynthetic algae. Hope this answers the question.
3 0
3 years ago
Read 2 more answers
What is artificial selection?
Nikolay [14]

Answer:

A

Explanation:

Artificial means man made or not made by nature basically, meaning that humans breeding organisms for certain characteristics would be artificial.

8 0
2 years ago
The diagram shown represents a cell that will undergo mitosis. Which diagrams below best illustrate the nuclei of the daughter c
Tems11 [23]

it looks like a mad face hehehehe

4 0
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