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Mazyrski [523]
3 years ago
14

1. which of these statements are true about sperm and egg cells?

Social Studies
2 answers:
valentinak56 [21]3 years ago
5 0
B. Sperm and egg cells are made during meiosis and question 2 is B. Sperm
Rashid [163]3 years ago
4 0

<u><em>Question 1: B. Sperm and egg cells are made during meiosis and Question 2: A.Spores</em></u>

<u><em>I took the test so these are correct</em></u>

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What does it mean to be a veteran in the united states?
tekilochka [14]
A veteran is a former member of the Armed Forces of the United State (Army, Navy, Air Force, Marine Crops, and Coast Guard) who served on active duty and was discharged under conditions, which were other than dishonorable

7 0
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Sally is the manager of Grubb It, a fast-food outlet. She is looking out for trends or events that could turn out to be a proble
kicyunya [14]

Answer:

This question is incomplete. Here are the missing options:

  • <u>a. environmental scanning</u>
  • b. stakeholder mapping
  • c. contingency planning
  • d. a strategic review process

The answer is a. environmental scanning.

Explanation:

Environmental scanning consists in observing an organisation's internal and external environment. This is done in order to improve the current and future state of a company.

In the example, Sally is concerned with the external environment. Some of the factors to examine are recent events, competition and the physical environment.

8 0
3 years ago
British explorer Henry Hudson made his third voyage to the "New World" in 1609. What was the BIGGEST obstacle he faced on this j
GrogVix [38]

Believed to have been born in the late 16th century, English explorer Henry Hudson made two unsuccessful sailing voyages in search of an ice-free passage to Asia. In 1609, he embarked on a third voyage funded by the Dutch East India Company that took him to the New World and the river that would be given his name. On his fourth voyage, Hudson came upon the body of water that would later be called the Hudson Bay.

The third voyage was the worst. When some members of Henry Hudson's crew set off to find food on the shore, the First Nations attacked them and killed one of Henry Hudson's men. The man that died was one of the most important men on the ship. He would keep watch to see if there were chunks of ice up ahead and if there were dead ends. On his last voyage, Henry Hudson encountered the menacing  ice. This ice was so thick that his boat was stuck. By the time the ice melted and the boat was free, his unhappy crew plotted against him and set him adrift in a boat with his son and a few other crew members

6 0
3 years ago
Jeremy had a run in with a german shepherd. he avoids this dog, but approaches other breeds of dog without hesitation. jeremy`s
pantera1 [17]
Jeremy's behavior is under pretty tight stimulus control.
Stimulus control refers to the fact that an individual will behave one way when presented with a particular stimulus, and behave completely differently when that stimulus is absent. In Jeremy's case, he avoids any interaction with that German shepherd, but he is not afraid of dogs in general. 
3 0
3 years ago
How to put survival in study when subjects are added in 10 months period?
Evgen [1.6K]
Learning Objectives

After completing this module, the student will be able to:

<span>Identify applications with time to event outcomesConstruct a life table using the actuarial approachConstruct a life table using the Kaplan-Meier approachPerform and interpret the log rank testCompute and interpret a hazard ratioInterpret coefficients in Cox proportional hazards regression analysis</span>

Time to Event Variables

There are unique features of time to event variables. First, times to event are always positive and their distributions are often skewed. For example, in a study assessing time to relapse in high risk patients, the majority of events (relapses) may occur early in the follow up with very few occurring later. On the other hand, in a study of time to death in a community based sample, the majority of events (deaths) may occur later in the follow up. Standard statistical procedures that assume normality of distributions do not apply. Nonparametric procedures could be invoked except for the fact that there are additional issues. Specifically, complete data (actual time to event data) is not always available on each participant in a study. In many studies, participants are enrolled over a period of time (months or years) and the study ends on a specific calendar date. Thus, participants who enroll later are followed for a shorter period than participants who enroll early. Some participants may drop out of the study before the end of the follow-up period (e.g., move away, become disinterested) and others may die during the follow-up period (assuming the outcome of interest is not death).

In each of these instances, we have incomplete follow-up information. True survival time (sometimes called failure time) is not known because the study ends or because a participant drops out of the study before experiencing the event. What we know is that the participants survival time is greater than their last observed follow-up time. These times are called censored times.

Censoring

There are several different types of censoring. The most common is called right censoring and occurs when a participant does not have the event of interest during the study and thus their last observed follow-up time is less than their time to event. This can occur when a participant drops out before the study ends or when a participant is event free at the end of the observation period.

In the first instance, the participants observed time is less than the length of the follow-up and in the second, the participant's observed time is equal to the length of the follow-up period. These issues are illustrated in the following examples.

 

Example:

A small prospective study is run and follows ten participants for the development of myocardial infarction (MI, or heart attack) over a period of 10 years. Participants are recruited into the study over a period of two years and are followed for up to 10 years. The graphic below indicates when they enrolled and what subsequently happened to them during the observation period.

During the study period, three participants suffer myocardial infarction (MI), one dies, two drop out of the study (for unknown reasons), and four complete the 10-year follow-up without suffering MI. The figure below shows the same data, but shows survival time starting at a common time zero (i.e., as if all participants enrolled in the study at the same time).


8 0
3 years ago
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