Explanation

The unit of rock that represents all rocks formed during the same geological time scale is a Series. 

Geochronologic Units:

The units of time in the geological time scale are called geochronologic units (e.g., eon, era, period, epoch)

Explanation

 Direct observation methods for tracking mammals have limitations, especially for nocturnal species.

Since these animals are active at night, low visibility makes it difficult to observe them directly.

Additionally, dense habitats and shy behavior further reduce the effectiveness of this method.

Explanation

 Non-invasive Genetic Sampling:

This method involves collecting genetic material (like DNA) from animals without direct contact, for example, through scat, hair, or shed skin.

Applications:

Species Identification: Identifying species based on genetic markers.

Individual Identification: Distinguishing between individuals within a population.

Population Size Estimation: Estimating the size of a population using genetic data.

Genetic Diversity Analysis: Assessing the genetic diversity and structure of populations.

Explanation

 Bilateral symmetry is crucial for an active lifestyle as it allows for efficient movement and better sensory perception.

Organisms with bilateral symmetry, such as humans and most animals, have a streamlined body plan that enhances coordination, directional movement, and faster responses to environmental stimuli.

Explanation

The pectoral and pelvic fins are the paired fins in fishes. 

Paired fins:

Fish have two sets of paired fins: pectoral and pelvic. 

Pectoral fins:

These are located on the sides of the fish, and they are used for steering and maneuvering. 

Pelvic fins:

These are located on the ventral (belly) side of the fish, and they help with balance and stability. 

Unpaired fins:

The dorsal, anal and caudal fins are unpaired and situated along the midline of the body. 

Explanation

Goblet cells are specialized cells that produce and secrete mucus, a key component of the protective mucus layer lining the respiratory and gastrointestinal tracts. 

Explanation

 The standard weight of a cricket ball used in professional matches ranges between 155.9 grams (5.5 ounces) and 163 grams (5.75 ounces).

This weight is mandated by the International Cricket Council (ICC) for international matches and is consistent across all game formats.

Explanation

 To calculate the duration between 21:30 (9:30 PM) and 7:30 (7:30 AM), follow these steps:

Convert to 24-Hour Format:

Departure: 21:30

Arrival: 07:30 (next day)

Calculate Duration:

From 21:30 to midnight (00:00): 2 hours 30 minutes

From midnight to 07:30: 7 hours 30 minutes

Total duration: 2:30 + 7:30 = 10 hours

Therefore, the correct answer is B. 10 Hours.

Explanation

"We have respect for our leaders."

 "for" indicates the object or recipient of the respect.

"Respect for" someone/something → This structure is used when expressing admiration, honor, or regard toward a person or concept.

Explanation

The Line Transect Method is a survey technique where an observer follows a fixed pathway (transect) and records bird sightings along the way.

This method is useful for estimating bird populations, species distribution, and habitat preferences.